Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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Award type：Award from Japanese society, conference, symposium, etc. 

Award type：Award from Japanese society, conference, symposium, etc. 

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Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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Country：Japan

Country：Japan

Country：Japan

Publisher：IABSE Symposium Tokyo 2025 Environmentally Friendly Technologies and Structures Focusing on Sustainable Approaches Report  

This study investigated the improvement of fatigue strength at the weld root in out-of-plane gusset welded joints by induction heating (IH). IH works by locally heating the object with coils energized by high-frequency AC power, which can alter the residual stress distribution. Unlike other methods such as weld toe treatment, IH does not need to treat the potential crack initiation site directly, making it a promising approach for improving fatigue strength at the weld root. The improvement in fatigue strength by IH was verified using fatigue tests under out-of-plane bending loads with a vibration-type fatigue testing machine. Further numerical investigation based on finite element analysis to reproduce the welding and IH clarified the residual stress distributions around the weld.

DOI： 10.2749/tokyo.2025.1159

Scopus

Publisher：IABSE Symposium Tokyo 2025 Environmentally Friendly Technologies and Structures Focusing on Sustainable Approaches Report  

Residual stress in welds is a critical factor influencing the fatigue strength of welded joints. Understanding the residual stress distribution, both on the surface and within the interior of the plates, is essential for improving the accuracy of fatigue strength evaluations in welded joints. This study aims to numerically evaluate the through-thickness residual stress at the weld toe of T-joints using the slitting method. This approach involves welding simulation, slitting simulation, and fracture mechanics to investigate the relationship between the internal residual stress and the strain changes on the plate surface near the weld toe, which occur due to stress relief during the slitting process. The results indicate that the through-thickness residual stress distributions estimated through the slitting method are consistent with those initially present in the welded joint, even under varying conditions such as different initial residual stress distributions, geometrical parameters of the joint (e.g., plate thickness, weld size), and slitting conditions (e.g., slit width and location, cutting depth ratio). Furthermore, this study identifies an optimal slitting strategy, which enhances the accuracy of residual stress evaluation.

DOI： 10.2749/tokyo.2025.2459

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.2208/jscejj.23-00234

DOI： https://doi.org/10.2208/jscejj.23-00234

Open Access

Publisher：Welding in the World  

The structural hot-spot stress approach is an effective method for assessing welding details when nominal stress is hard to determine due to geometric or loading complexities. Hot spots can be classified into two types: type “a,” which refers to a weld toe located on a plate surface, and type “b,” denoting one located on a plate edge. Previous studies on type “b” hot spots have mainly focused on in-plane gusset welded joints, and the applicability of type “b” hot-spot S-N curves proposed for in-plane gusset joints in IIW to the other details is not well understood. In this study, fatigue tests were conducted with a load-carrying attachment welded on a plate surface, where a crack occurred from a weld toe on the plate edge. The tests were also numerically simulated using finite element analysis. Upon evaluating the test results through the nominal stress, structural hot-spot stress (4, 8, and 12 mm method), and notch stress approaches, it was found that all the data lie above FAT71 for nominal stress, FAT100 for hot-spot stress, and FAT225 for effective notch stress.

DOI： 10.1007/s40194-024-01724-6

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Publisher：International Journal of Steel Structures  

Numerous studies have been conducted regarding the fatigue strength of longitudinal welded gusset joints. Most studies employed relatively small specimens. Thus, this study aims to evaluate the variation of fatigue life of longitudinal welded gusset joints by using the probabilistic fracture mechanics approach, particularly for larger specimens. Although some studies claimed that lower fatigue strength is found in the thicker main plate specimens, however only a limited number of fatigue test was conducted. A probabilistic approach was employed to conquer the shortfall. In this study, fatigue crack propagation analysis was performed on the main plate thicknesses of 12, 40, and 60 mm to evaluate the effect of main plate thickness on the fatigue life of the joints. Then, a probabilistic approach is given to investigate the variation of fatigue life of the joint. In addition, fatigue tests were carried out to investigate the crack propagation behavior on larger specimens. A significant decrease in fatigue life was observed by the increase of the main plate thickness from 12 to 40 mm, however, no further decrease thereafter. The fatigue strength of longitudinal welded gusset joints with the main plate thickness of 12 mm was appertained to category F in the JSSC design curve. Meanwhile, the fatigue strength of longitudinal welded gusset joints with the main plate thickness of 40 and 60 mm falls into category G in JSSC. This condition was also confirmed by the fatigue test results, where both specimens were classified as category G in JSSC.

DOI： 10.1007/s13296-024-00812-z

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Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese  

DOI： https://doi.org/10.11273/jssc.31.121_115

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.11273/jssc.31.121_72

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Steel Construction  

<p>Many fatigue tests have been conducted to reproduce a root crack in deck-to-U rib welded joints and to investigate its fatigue durability. Nevertheless, no unified fatigue strength evaluation method for the root crack has been established. In this study, total of 154 fatigue test results were reproduced in the analysis to obtain artificial notch stress at weld root, and the test results were rearranged by the notch stress. Two million cycles fatigue strength and its standard deviation based on the notch stress are discussed in this paper. Two million cycles fatigue strength tends to be higher when the mean stress in cyclic loading is in compression. By correcting the test results with the stress ratio, all test results located around a unified fatigue strength curve.</p>

DOI： 10.11273/jssc.31.121_72

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Language：Japanese   Publisher：Japanese Society of Steel Construction  

<p>In this study, as a preventive maintenance method against root cracks at welded joints of cover plates, the tap bolt joint method with tap holes in both plates was proposed based on the concept of reducing the relative displacement between plates which is the cause of root crack initiation. As a fundamental study on the tap bolt joint, the fatigue strength of the joint and relative displacement of plates were evaluated by fatigue tests and FEA. It was revealed that the fatigue strengths were distributed around JSSC-E to F classes under cyclic tensile axial loads, JSSC-A class under cyclic compressive axial loads and much higher than JSSC-S class under cyclic shear loads.</p>

DOI： 10.11273/jssc.31.121_115

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DOI： https://doi.org/10.11532/structcivil.70A.458

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.11532/structcivil.70A.521

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.11532/structcivil.70A.577

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

<p>Several corner weld failures of steel piers during large earthquakes have been attributed to the rupture of corner welds with unwelded section. First, both of tensile tests and finite element analysis of the corner weld model were conducted parametrically in order to clarify the fracture mechanism of corner welds. As a result of the study, a fracture process was observed in which the cracks firstly occurred in the inner corner welds and then in the outer welds. Next the simplified verification method for the corner weld was also investigated. As a result of the investigation, it was found that the approximate bending strength can be calculated without considering the effects of stress concentration. In the future, we plan to investigate structural models through experiments and finite element analysis.</p>

DOI： 10.11532/structcivil.70A.577

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

<p>Fatigue cracks were initiated at slotted tubular joints in a testing overhead transmission tower. It was estimated that the cracks were caused by vortex induced vibration (VIV). In this study, the fatigue evaluation for steel tub ular memb ers in the tower was conducted with observed wind data and a response estimation method for VIV. The fatigue damage ratios of horizontal members and web members on the north side of the tower were good agreement with the actual failure state. However, those of members in the cross arm section were low accuracy because stress ranges were similar to the cut-off limit and wind was disturbed by upwind members Moreover, it was clarified that slenderness ratio of a member with a high fatigue damage ratio was limited to a certain range.</p>

DOI： 10.11532/structcivil.70A.521

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

<p>In orthotropic steel deck, many fatigue crack has been found at the weld joint between deck plate and vertical stiffeners. As a counter measure for the fatigue, semi-circular notch has been adopted to reduce the stress concentration around boxing weld. However, more effective notch geometry should be considered from viewpoint of ease of construction and fatigue improvement. In this study, reduction of stress and stress intensity factor were investigated for newly developed slit-like notch and sigma-shaped notch. In addition, fatigue tests were performed for the weld joints between deck plate and vertical stiffener with sigma-shaped notch. The crack initiation life and crack propagation can be extended by constructing sigmashaped notch at the top of vertical stiffener.</p>

DOI： 10.11532/structcivil.70A.458

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p> Many cases of fatigue cracks at welded joints of sole plates in steel bridges have been reported. And the causes of the cracks generation and countermeasures have been studied. However, the study has so far mainly focused on corrective maintenance, and practical preventive maintenance measures have not been established. In this study, focusing on the toe crack and root crack that generates at welded joint of sole plate, preventive maintenance measures by peening treatment and tap bolts were studied by FEA and fatigue tests. As a result, it was clarified that the peening treatment could improve the fatigue strength of the weld toe of sole plate under the conditions of compressive stress acting on the weld, and the method using tap bolts could extended the fatigue life of the weld root of sole plate.</p>

DOI： 10.2208/jscejj.23-00234

Open Access

CiNii Research

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Publisher：Welding in the World  

Root cracks initiating from U-rib to deck welded joints of orthotropic steel deck bridges have become a problem for maintenance. Some fatigue strength evaluation methods for root cracks based on local stress criteria have been proposed, such as the effective notch stress method, but these methods cannot evaluate fatigue strength directly from the measurable response values of the structure. In this study, the evaluation method of crack initiation by measurable stresses was investigated by fatigue tests and FE analysis for both deck and bead propagation-type cracks, which are root cracks in U-rib to deck welded joints of orthotropic steel decks. As a result of the study, the relationship between the stress of weld root and the fatigue life was obtained by using the fillet shaped notch stress as the evaluation stress, and the S-N curve for the evaluation stress was proposed. And a method to estimate the evaluation stress of the root from the measurable stresses at four points was proposed. It was confirmed that the error of the proposed estimation method was generally within 10%. As a validation of the estimation method, it was confirmed that the fatigue test results could be properly evaluated.

DOI： 10.1007/s40194-023-01568-6

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Publisher：Aip Conference Proceedings  

Steel gable frames is a structure type widely used for warehousing. Such structure is characterized by the long span roof truss and minimum number of columns to optimaze storage capacity. A gable frame is commonly composed by single profile of rafter and column to ensure the compactness of sectional area. However, in many cases, the capacity of single profile cannot be met and a gable frame has to be established from built up profile sections. This paper analytically investigated a design of gable frame constructed from built up profiles with considering unsymmetrical slopes in rafter. Three different unsymmetrical steel gable frames (SGF) with different rafter slope at the left and right side were provided. For each model, the left rafter has gentler slope than the right rafter. The models were named according to the left rafter slope: SGF 10 (10-degree slope), SGF 20 (20-degree slope), and SGF 30 (30-degree slope), respectively. First, the model of gable was established and load combinations were applied. The internal forces obtained from analysis were used to design the gable frames. The design referred to SNI-1729-2020. This study revealed that SGF 30 experienced the lowest internal forces and resulted the smallest sectional area for rafters and columns. Furthermore, torsional effects were also negligible in all steel gable frames. Investigation on three gable frames indicated that SGF 30 which has the steeper slopes exhibited the best performance than the SGF 10 and SGF 20.

DOI： 10.1063/5.0137293

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.11532/structcivil.69A.568

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

<p>In this study, a screening method for the fatigue cracks around the sole plate welds in preventive maintenance was studied based on measurements of the actual bridge and finite element analysis. First, the results of the actual bridge measurements show that the compressive stress at the lower surface of the lower flange increases as closer to the sole plate welds. Next, by parametric study with plate thickness, it was shown that the hot-spot stress range at the front fillet weld toe between the lower flange and sole plate can be estimated by the local cross-sectional area and the horizontal reaction force. Based on the results, a formula for the hot-spot stress range at the front fillet weld toe between the lower flange and sole plate was proposed to screen locations at high risk against fatigue.</p>

DOI： 10.11532/structcivil.69A.568

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DOI： 10.1007/s13296-022-00677-0

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.2208/jscejj.22-00231

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

<p> This paper proposes a countermeasure for fatigue cracks that propagate from the weld root of U-rib to deck welded joints to the deck plate or weld bead of orthotropic steel deck. Specifically, the lower flange of the U-rib is removed and the U-rib and deck plate welds are welded from the inside of the U-rib as a countermeasure method. First, to confirm the feasibility of this countermeasure with structural changes, the load-bearing capacity, workability of welding, and effects on asphalt pavement were verified. Next, changes in the local stress properties of the focused welds and other areas due to the countermeasures were confirmed by finite element analysis. Finally, the fatigue durability of the countermeasure was determined by fatigue tests.</p>

DOI： 10.2208/jscejj.22-00231

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Publisher：Bridge Safety Maintenance Management Life Cycle Resilience and Sustainability Proceedings of the 11th International Conference on Bridge Maintenance Safety and Management Iabmas 2022  

This paper examines a fatigue evaluation method for the cracks in the weld joints between a U-rib and a deck plate in orthotropic steel bridge decks. The crack initiates from the weld root and propagates into the deck plate or the weld bead. Fatigue tests and FE analyses were conducted in order to examine the local stresses available for fatigue assessment, and to propose a method to estimate them from some reference stresses around the weld joint. In addition, based on fatigue crack propagation analyses, a method to predict the crack propagation path was proposed.

DOI： 10.1201/9781003322641-263

Scopus

Language：English   Publisher：Japan Society of Civil Engineers  

<p>Fatigue cracks have been observed from welded joints of end diaphragms at steel railway troughgirder bridges due to vertical movement behavior at their supports that is not expected during the design phase. Since this movement behavior is complicated and varies on each bridge depending on the damage around the support, effective retrofitting methods against the crack have not been established yet. In this study, the influence of the vertical movement tendency at the bridge supports on the crack initiation location and crack propagation behavior at the end diaphragm was investigated through numerical simulation. The result indicated that the relative displacement at the bedplate affected the crack initiation location and crack propagation path, and that the stress intensity factor tended to gradually decrease after propagating a certain length.</p>

DOI： 10.11532/structcivil.69a.558

CiNii Research

Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.14920/jwstaikai.2023s.0_180

CiNii Research

Publisher：Bridge Safety Maintenance Management Life Cycle Resilience and Sustainability Proceedings of the 11th International Conference on Bridge Maintenance Safety and Management Iabmas 2022  

In this study, the effect of the stress state of a welded joint during application of high-frequency mechanical impact (HFMI) treatment on the resulting fatigue strength was investigated through fatigue tests and finite element analysis. A high-frequency impact treatment tool was used as the HFMI device. Longitudinal attachment welded joints were treated under a state in which a static load was applied and subsequently tested under a constant stress amplitude with stress ratios of 0 or 0.5. In addition, residual stress measurements and finite element analysis simulating welding and treatment processes were performed. The results indicate that the HFMI treatment is beneficial even when applied under a static tensile load, as the resulting compressive residual stresses are similar regardless of the stress state in the joint during treatment, meaning that the HFMI is applicable to existing structures.

DOI： 10.1201/9781003322641-262

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s13296-022-00660-9

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DOI： https://doi.org/10.11532/structcivil.68A.580

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

<p>Corner plates are often welded at the intersection between web and flange in steel box girders. As a measure against fatigue in the weld joint between corner plate and lateral rib, the end of corner plate was cut-out in U-shape. Nevertheless, fatigue cracks have been generated from exposed root on the cut-out surface. In this study, fatigue strength and fatigue life improvement by ICR treatment were investigated. The fatigue strength of the weld joint was JSSC-G class. Application of ICR treatment improves the fatigue strength by 1 grade or more, and the fatigue limit was improved as 59 N/mm² or more. Furthermore, stress concentration factor around exposed root was investigated by finite element analysis.</p>

DOI： 10.11532/structcivil.68A.580

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s40194-021-01208-x

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s40194-021-01230-z

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Publisher：Welding in the World  

The publication of this article unfortunately contained mistakes. Figure 7 was not correct. You can find the updated figure 7 below. The original article has been corrected.

DOI： 10.1007/s40194-022-01264-x

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s13296-021-00559-x

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DOI： 10.2749/prague.2022.0783

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p> This paper examines application of a fatigue evaluation method for the cracks in the weld joints between a U-rib and a deck plate in orthotropic steel bridge decks. Field measurements were conducted in two sections with different crack initiation trends, and a method was proposed to obtain the cumulative fatigue damage ratio from the measurement results and routinely obtained data such as temperature and traffic volume. In addition, the validity of the evaluation of crack initiation and propagation direction by the developed evaluation method is verified by comparing with the actual crack situation, and a method to screen out the priority inspection and investigation area is proposed.</p>

DOI： 10.2208/jscejseee.78.2_287

Open Access

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p>In this study, the effect of the stress state of a welded joint during application of high-frequency mechanical impact (HFMI) treatment on the resulting fatigue strength was investigated. Longitudinal attachment joints were treated under a state in which a static load was applied and subsequently tested under a constant stress amplitude with stress ratios of 0 or 0.5. The test results indicated that enhanced fatigue strength can be achieved even under a high stress ratio when the joint is treated under the minimum stress of fatigue loading. In addition, residual stress measurements and finite element analysis simulating a treatment process indicated that the magnitude of compressive residual stress introduced to a weld toe is similar regardless of the stress state in the joint during treatment.</p>

DOI： 10.11532/structcivil.68a.591

CiNii Research

Publisher：IABSE Symposium Prague 2022 Challenges for Existing and Oncoming Structures Report  

Corner plates are sometimes added to the web-to-flange joints of box girder bridges by welding on a single side to increase stiffness. In the case of the Minatogawa Bridge on the Hanshin Expressway, a steel box girder with low girder height and corner plate was used to reduce the weight of the superstructure. In this bridge, many fatigue cracks were observed in the welds of the corner plates. As a crack suppression measure, the end of corner plate was cut-out in U-shape. Although the stress concentration relaxation reduced the risk of crack initiation, the risk of crack initiation starting from the un-welded area still remains. In this study, we focused on peening as a countermeasure to improve the fatigue endurance. As a result, it was confirmed that peening to the un-welded area was effective in improving the fatigue endurance.

DOI： 10.2749/prague.2022.0783

Scopus

Language：English   Publisher：Japanese Society of Steel Construction  

<p>In this study, fatigue crack growth was retarded by injecting corrosion accelerator, Nitric acid (HNO₃), into the crack to induce corrosion. The presence of the corrosion products is expected to reduce the crack opening width and act as a wedge to control the crack closure. Fatigue tests were carried out on the compact tension (CT) specimens. The test revealed that the corrosion process due to HNO₃ injection ends after 24 hours. Then, the reduction in crack opening displacement range can be observed. Retardation in the crack growth was observed regardless of the load range and the effective stress intensity factor range (Δ<i>K_eff</i>) at injection. Meanwhile, the retardation level tends to be affected by the Δ<i>K_eff</i> and crack length at injection.</p>

DOI： 10.11273/jssc.28.112_111

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Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)  

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DOI： https://doi.org/10.2208/jscejseee.77.2_255

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

<p> This paper examines a fatigue evaluation method for the cracks in the weld joints between a U-rib and a deck plate in orthotropic steel bridge decks. The crack initiates from the weld root and propagates into the deck plate or the weld bead. Fatigue tests and FE analyses were conducted in order to examine the local stresses available for fatigue assessment, and to propose a method to estimate them from some reference stresses around the weld joint. In addition, based on fatigue crack propagation analyses, a method to predict the crack propagation path was proposed.</p>

DOI： 10.2208/jscejseee.77.2_255

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Language：English   Publishing type：Part of collection (book)   Publisher：Japan Society of Civil Engineers  

<p>Low cycle fatigue is a failure mode which is possibly caused by random large strains such as seismic motion. To examine the effects, this study elaborated crack propagation behavior in steel under random amplitude loading. Firstly, study on crack growth rate under constant amplitude conditions was conducted to obtain basic characteristics. Next, several patterns of random amplitude loading were applied. It is discovered that crack growth accelerated when amplitude decreased from high to low levels at tensile portions, compared to that in constant amplitude conditions. Prediction model was constructed with establishing relationship between cyclic J-integral range and crack growth rate and confirmed to give good estimation.</p>

DOI： 10.11532/structcivil.67A.174

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DOI： https://doi.org/10.1201/9780429279119-365

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： https://doi.org/10.1201/9780429279119-478

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.11532/structcivil.67A.174

Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： https://doi.org/10.1201/9780429279119-496

Language：Japanese   Publisher：Japanese Society of Steel Construction  

<p>Low-yield point steel has been used in seismic control dampers due to its high energy absorption ability. Meanwhile, thermal cycle during welding can change mechanical properties and microstructure of low-yield point steel. In addition, large plastic strains caused by seismic motion can induce defects in microstructure. They can cause the reduction in toughness of the low-yield point steel. In this study, Charpy impact tests were performed for low-yield point steel with thermal cycle simulating heat affected zone and preliminary plastic strain. Significant reduction in Charpy absorbed energy was observed when applying simulated thermal cycle, while the preliminary strain gives insignificant reduction.</p>

DOI： 10.11273/jssc.28.109_183

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Language：Japanese   Publisher：Bridge Maintenance Safety Management Life Cycle Sustainability and Innovations Proceedings of the 10th International Conference on Bridge Maintenance Safety and Management Iabmas 2020  

Fatigue cracks have been observed at welded joints between U-ribs and deck plates in many orthotropic steel decks. Considering a fatigue crack at rib-to-deck welded joints can compromise transportation safety, it is necessary to detect and repair the crack at the early development stage. This paper presents the accuracy of crack sizing with a Phased Array Ultrasonic Testing (PAUT) scanner developed for inspection. Firstly, an internal crack propagating from a weld root was induced at rib-to-deck welded joints by using a plate bending fatigue testing machine. Subsequently, the joints were inspected with the PAUT scanner. Appropriate sizing methods were determined for the deck and weld bead propagation type cracks, respectively, and the accuracy of crack sizing was evaluated. In addition, the influence of coating on the accuracy in crack sizing was examined. As a result, it is demonstrated that the PAUT scanner had enough crack sizing performance.

DOI： 10.1201/9780429279119-540

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DOI： 10.1201/9780429279119-496

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DOI： 10.1201/9780429279119-365

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DOI： 10.1201/9780429279119-478

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<p> This study investigated opening and closing behavior of root gap and weld crack occurance in slit-welding under cyclic loading through welding tests and thermal elasto-plastic finite element analysis. Sectional observations after the welding test revealed that the crack occurance highly depends on the magnitude of root gap opening displacement and loading frequency in welding process, and also restraint intensity of slits. Then, through the simulation of welding under cyclic loading, it was clarified that root gap opening behavior during welding changes due to the restraint intensity of the slit, which correlates the tendency of the crack occurance under different restraint conditions. Based on the test and analysis results, a conditional expression for the weld crack occurrence consist of the initial root gap opening displacement, loading frequency and restraint intensity of slits was obtained, and its validity was verified by the experiments.</p>

DOI： 10.2208/jscejseee.77.2_287

Open Access

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p> In riveted bridges, generally, rivets deteriorated with loosening and corrosion are replaced with high-strength friction-type bolts. In this case, both riveted and bolted connections which have different load transfer mechanism coexist in the same joint, however, the mechanical behavior and limit states of the rivet-and-bolt combination joints have not been well investigated yet. In this study, in order to investigate the mechanical behavior and limit states of the combination joints using rivets and bolts, static tensile tests were performed on specimens with different arrangement of rivets and bolts. Moreover, finite element analysis was performed to investigate load transfer mechanism in the combination joints. Based on the experiment and analysis, the evaluation method for the strength of the combination joints was indicated.</p>

DOI： 10.2208/jscejseee.77.3_489

Open Access

CiNii Research

Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.2207/jjws.90.364

CiNii Research

Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.2207/jjws.90.360

Scopus

CiNii Research

Language：English   Publisher：Japanese Society of Steel Construction  

<p>Low cycle fatigue in steel caused by earthquakes can result in large cyclic strain failures. In the studies conducted to date, low cycle fatigue crack propagation has primarily been investigated under constant amplitude loading. However, actual seismic motions are characterized by amplitude changeability from high to low or from low to high levels, and the effect of these alterations on crack growth in steel has not yet been clarified. Accordingly, this study examines crack propagation patterns under two-steps variable amplitude loading, which has two different uniform amplitude steps. The first part of this paper examines crack growth rates under constant amplitude conditions to obtain basic characteristic. Then, several patterns of two-steps variable amplitude loading are investigated. Research results show that, when compared to constant amplitude conditions, crack growth rates in steel increase when the amplitude decreases from high to low levels. Finally, a formula containing finite element analysis parameters was constructed and verified, thus providing a new method for obtaining good estimations of the crack growth rate.</p>

DOI： 10.11273/jssc.27.108_93

CiNii Research

Authorship：Corresponding author   Language：English  

Authorship：Corresponding author   Language：English  

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Authorship：Last author   Language：Japanese  

Authorship：Last author   Language：Japanese  

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Language：Japanese   Publisher：International Journal of Steel Structures  

During the 2011 Tohoku Earthquake, a truss bridge joint structure was cracked due to large cyclic deformation, making us recognize the importance of assessing the seismic performance of joint structures in truss bridges from the viewpoint of low-cycle fatigue. In this study, seismic response analysis of an actual deck truss bridge was performed under different seismic waves, and local strain behavior generated at welded joints around a joint structure was clarified using a zooming analysis technique. The results revealed the possibility that welded joints for a lateral gusset-plate in a joint structure can be cracking sites during earthquakes. In addition, it was indicated that seismic isolation bearings can significantly reduce the local strain at the joint structure and improve its low-cycle fatigue performance. Moreover, as a simple countermeasure, weld toe treatment by grinding is also effective to decrease the possibility of low-cycle fatigue cracking at the joint structure.

DOI： 10.1007/s13296-020-00399-1

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Language：English  

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Language：Japanese   Publisher：Welding in the World  

This study investigated the applicability of low transformation temperature (LTT) arc welding consumables to improve fatigue strength against weld root failure. Transverse attachment joints formed by single-sided welding, similar to rib-to-deck connections in orthotropic steel bridge decks, were fabricated using an LTT welding consumable and conventional welding consumable. Fatigue tests were performed with out-of-plane bending loads using a vibration-type fatigue testing machine. The test results indicated that higher fatigue strength can be achieved in the joint with an LTT consumable compared with a conventional one. In addition, residual stresses around the weld bead were clarified by X-ray diffraction measurements and finite element analyses. The results revealed that the LTT consumable weld metal can reduce residual stress around the weld and also introduce compressive residual stress to the weld root, which can contribute to improved fatigue strength.

DOI： 10.1007/s40194-020-00915-1

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Language：English   Publisher：Japanese Society of Steel Construction  

<p>Low cycle fatigue is a failure mode exhibiting a small number of loading repetitions to failure. Former work conducting research on constant displacement amplitude presented crack growth rate was related to cyclic J-integral range, but the data were limited. This research aimed to provide additional information to cover study done at the past so that a formula for obtaining crack growth rate can be precisely proposed. Research work was conducted with applying two different cyclic displacement means of loading histories to CT specimen. Cumulative plots in crack growth rate addressed to past and current research work were found enforcing formula used for obtaining crack growth rate under larger cyclic strains proposed at the past.</p>

DOI： 10.11273/jssc.27.106_75

CiNii Research

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s40194-019-00834-w

Web of Science

Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p>This study investigated the applicability of low transformation temperature (LTT) welding consumables to improve fatigue strength against weld root failure. Transverse attachment joints formed by single-sided welding were fabricated using an LTT welding consumable and conventional welding consumable. Fatigue tests with out-of-plane bending loads revealed that higher fatigue strength and fatigue limit can be achieved in the joint with an LTT consumable compared with a conventional one. In addition, residual stresses around the weld bead were clarified by X-ray diffraction measurements and finite element analyses. The results indicated that the LTT consumable can reduce tensile residual stress around the weld and also introduce compressive residual stress to the weld root.</p>

DOI： 10.11532/structcivil.66a.607

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p>This study examined low cycle fatigue behavior of cruciform welded joints containing incomplete penetration. Six types of specimens with different sizes of weld penetrations and weld leg lengths were tested under cyclic plastic strains. The test results revealed that the fatigue strength and cracking patterns depend on the ratio of the weld penetration to the main plate thickness and the ratio of the weld leg length to the main plate thickness, respectively. Then, elasto-plastic finite element analyses including the effective notch concept were performed. The results indicate that the fatigue strength and cracking pattern of the specimens can be correlated with the local strain distribution around the effective notch.</p>

DOI： 10.11532/structcivil.66a.253

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p> Damaged steel bridge members are often repaired by patching steel plates with high strength bolts. Sometimes, due to spatial restriction, there is a need to be shorten bolt spacing or edge distance than those specified in a design specification. However, knowledge on fatigue performance of the joints with the compact bolt arrangement is little.</p><p> In this study, fatigue strength of friction type bolted joints with compact bolt arrangement was investigated through fatigue tests and finite element analyses. The test result indicated that the compact bolt arrangement, especially a smaller end distance, decrease the fatigue strength of the joints. The analysis results demonstrated that stress concentration occured at the surface around a bolt hole where the fatigue crack initiated in the test. Since the stress concentration was strongly correlated to the fatigue strength in the test, the effects of compact bolt arrangement with a variety of material strengths and joint dimensions were discussed based on the stress concentration.</p>

DOI： 10.2208/jscejseee.76.2_212

Open Access

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p> Over the last decade, fatigue cracks have been observed at welded joints between U-ribs and deck plates in many orthotropic steel deck bridges in Japan. Among the cracks, this paper focuses on fatigue cracks that initiate from a weld root of rib-to-deck welded joints and propagate to a deck plate. This study examines the effect of countermeasure with overlaying Ultra-High Performance Fibre Reinforced cement-based Composites (UHPFRC) on steel decks with cracks from U-rib welds, and confirms the fatigue durability of this countermeasure method. Specifically, the suppressing effect on crack propagation and the fatigue durability of UHPFRC itself and the interface between UHPFRC and the deck plate were confirmed by a wheel running test and finite element analysis. As a result, it was clarified that this countermeasure has a positive effect to retard further crack propagation compared with a countermeasure with overlaying steel fiber reinforced concrete which is generally adopted. In addition, it was revealed that this countermeasure has enough fatigue durability.</p>

DOI： 10.2208/jscejseee.76.3_542

Open Access

CiNii Research

Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.14920/jwstaikai.2020s.0_186

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p> In this study, the fatigue strength of welded joints in steel-concrete composite slabs was investigated by fatigue testing. In addition, the local stress around the welded joint was evaluated through finite element analysis. In the test, fatigue cracks occurred at the toes of boxing welds of L-shaped shear connectors as a result of stress concentration due to the local out-of-plane bending deformation of the steel plates around the boxing weld. This local deformation can be produced by the steel and concrete behaving independent of one another locally near welds when the bond at their interface is lost. The test results demonstrated that the fatigue assessment of welded joints in a composite slab can be performed using the hot-spot stress approach. Then, actual composite slabs with different structural characteristics were analyzed to investigate the local stress behavior around welded joints, and their fatigue performance was assessed based on the hot-spot stress approach.</p>

DOI： 10.2208/jscejseee.76.5_ii_50

Open Access

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s40194-019-00745-w

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s13296-018-0199-3

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

There were the following typos in the article, "Journal of Structural Engineering A, Vol.64A (2018), pp.435-444"

DOI： 10.11532/structcivil.65a.975

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

There were the following typos in the article, "Journal of Structural Engineering A, Vol.64A (2018), pp.445-454"

DOI： 10.11532/structcivil.65a.976

CiNii Research

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

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Publisher：Welding International  

This study examined the fatigue strength of cruciform joints and longitudinal joints fabricated with laser-arc hybrid welding, in which tack welds were installed at the connection. The cruciform joints were tested under tensile cyclic loads and out-of-plane bending cyclic loads. In the longitudinal joints, four-point bending fatigue tests were performed on plate girders fabricated with the hybrid welding. In addition, finite element analysis was performed on the cruciform joint to investigate the effect of tack welds on stress concentration at weld toes. The test results revealed that the fatigue strengths of the hybrid welded joints are equivalent to those of arc welded joints with or without tack welds and satisfy the fatigue design curves specified in JSSC recommendation. Moreover, the analysis results indicated that tack welds have little influence on stress concentration at weld toes in cruciform joints fabricated with laser-arc hybrid welding.

DOI： 10.1080/09507116.2020.1860379

Scopus

Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

This study examined the fatigue strength of cruciform joints and longitudinal joints fabricated with laser-arc hybrid welding, in which tack welds were installed at the connection. The cruciform joints were tested under tensile cyclic loads and out-of-plane bending cyclic loads. In the longitudinal joints, four-point bending fatigue tests were performed on plate girders fabricated with the hybrid welding. In addition, finite element analysis was performed on the cruciform joint to investigate the effect of tack welds on stress concentration at weld toes. The test results revealed that the fatigue strengths of the hybrid welded joints are equivalent to those of arc welded joints with or without tack welds and satisfy the fatigue design curves specified in JSSC recommendation. Moreover, the analysis results indicated that tack welds have little influence on stress concentration at weld toes in cruciform joints fabricated with laser-arc hybrid welding.

DOI： 10.2207/qjjws.37.99

Open Access

Scopus

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publisher：Japanese Society of Steel Construction  

<p>Welded joints in steel structures are subjected to high strain amplitude during earthquake, which could cause a low cycle fatigue crack. To assess low cycle fatigue strength of welded joints, an estimation method based on local strain range at a crack initiation point has been established. In this method, an FE model with extremely-fine mesh is needed to obtain the local strain range accurately. In this paper, a prediction method of the local strain range from a model with relatively coarse mesh was proposed. Strain ranges obtained from coarse-mesh models were related to the local strain ranges from fine-mesh models. A prediction formula of the local strain range which is applicable to T-shaped joints, cruciform joints and out-of-plane gusset joints was established.</p>

DOI： 10.11273/jssc.25.97_61

CiNii Research

Language：Japanese  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p>A typical repair method for fatigue cracks in steel bridge members is the splice plate method. The crack tip is drilled out, and splice plates are added over the crack. For evaluating the remaining fatigue life of the repaired members, it is needed to know the stress of the drilled hole after adding splice plates. In this study, the effect of the splice plate’s geometric parameters on the stress reduction of a drilled hole was investigated by tensile tests and parametric FE analyses. As a result, a new method to estimate the stress of the drilled hole was proposed, considering stress carrying mechanism of the splice plate. This method could estimate the stress within 10% error.</p>

DOI： 10.11532/structcivil.64a.435

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p>Adding splice plates is a commonly used technique to repair fatigue cracks. The crack tip is drilled out before the splice plates are add. In some cases, however, a new fatigue crack initiates from the drilled hole. Because the drilled hole is entirely covered by the splice plates, it is impossible to measure its strain that can be used to assess the crack generation from the drilled hole. The purpose of this study is to propose a method to estimate the strain of the drilled hole by using a reference strain on the splice plate. By conducting parametric FE analyses and loading tests, the location for the reference strain which is strongly correlated with the strain in the drilled hole was proposed.</p>

DOI： 10.11532/structcivil.64a.445

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

Fatigue cracks have been reported in I-beam ends of railway steel bridges, which occur at a lower end of an I-beam web. As a temporary countermeasure, the crack is typically repaired with a drilling hole at its tip, called a stop-hole method. In the cracked I-beam ends, however, the effect of life extension due to a stop-hole has not been clearly evaluated yet. In this study, the life extension of cracked I-beams by applying a stop-hole was investigated through fatigue tests using an actual I-beam bridge removed from the field. And also, in order to make sure local stress distribution around the stop-hole in the test, finite element analyses were performed. As a result, it was proven that the fatigue life of the repaired I-beam can be predicted from the local stress range at the stop-hole edge. Furthermore, it was revealed that the maximum stress along a stop-hole tends to decrease as a crack becomes long, meaning that the effect of the stop-hole varies depending on crack length.

DOI： 10.2208/jscejseee.74.290

Open Access

CiNii Research

Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

This study examined fatigue strength of cruciform joints fabricated with laser-arc hybrid welding. Load-carrying and non-load-carrying cruciform welded joints with a plate thickness from 8mm to 25mm were tested under tensile cyclic loads and out-of-plane bending cyclic loads. Measurements of weld toe profile, residual stress and hardness around a welded portion were also conducted. The test results revealed that the fatigue strength of the hybrid welded joints is equivalent to that of arc welded joints and satisfies the fatigue design curves for arc welded joints in JSSC recommendation. Besides, the thickness effect on fatigue strength was observed in the hybrid welded joints as well as in arc welded joints.

DOI： 10.2207/qjjws.36.219

Open Access

Scopus

CiNii Research

Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.2207/jjws.87.252

Scopus

CiNii Research

Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.14920/jwstaikai.2018f.0_288

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

Over the last decade, fatigue cracks have been observed at welded joints between trapezoidal ribs and deck plates in many orthotropic steel deck bridges in Japan. Considering a fatigue crack at rib-to-deck welded joints can cause pavement damage and thus compromise transportation safety, it is necessary to detect and repair it at the early stage of its development.<br> This paper presents the accuracy of crack sizing with an electrically driven phased array ultrasonic scanner (PAUT scanner) developed for inspection of rib-to-deck welded joints in orthotropic steel decks. The PAUT scanner simultaneously examines a deck plate and a weld bead into either of which cracks propagate from a weld root. Moreover, it can detect the cracks as remained in the steel members.<br> In this research, firstly an internal crack is induced at rib-to-deck welded joints by using a plate bending fatigue testing machine where crack sizes are controlled by monitoring stresses at regions closed to weld beads. Subsequently, the joints are inspected with the PAUT scanner. Appropriate sizing methods are determined for the crack going through a deck plate and a weld bead, respectively, and the accuracy of crack sizing is evaluated by comparing with real cracks on the joints. In addition, the influence of paint coatings on the accuracy in crack sizing is examined. As a result of these investigation, it is demonstrated that the PAUT scanner has enough crack sizing performance.

DOI： 10.2208/jscejseee.74.516

Open Access

CiNii Research

Language：Japanese   Publisher：Japanese Society of Steel Construction  

<p>Multiple Steel Columns is an earthquake-resistance bridge pier which has shear panel dampers between four steel columns. In the previous study, although the shear panel damper absorbs the seismic energy, low-cycle fatigue crack has been observed around welding of shear panel. In this study, evaluation method of low-cycle fatigue based on local strain range at crack initiation point was applied to crack in shear panel. To simplify calculation of local strain range, relationship between mean shear strain range of shear panel and local strain range at crack initiation point was developed. For quasi-static and dynamic loading condition, crack initiation life was evaluated by simplified estimation method.</p>

DOI： 10.11273/jssc.24.96_17

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s40194-017-0504-3

Web of Science

Language：Japanese   Publisher：Japanese Society of Steel Construction  

<p>High strength bolted joints are often used in retrofittings steel bridges members，but sometimes bolts cannot be arranged by following current specification because of narrow spacing. There is no knowledge about the performance of the joints that spaced narrower than current specification. In this paper，we investigated the slip coefficient and the fracture strength of joins that bolts are spaced narrowly by tensile tests and parametric FE analysis. </p><p>As the result, the slip coefficient is not influenced by the bolt spacing. The fracture strength of compact spacing bolted joints is less than standard spacing，but it can be improved by increasing the plate thickness. The fractures strength was estimated by the conventional method within 10% error.</p>

DOI： 10.11273/jssc.24.95_25

CiNii Research

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Event date： 2024.9

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Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

researchmap

Event date： 2021.9 - 2019.9

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.9 - 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

researchmap

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2013.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2013.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2013.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2010.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2010.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2010

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2010

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2008

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2008

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan