Updated on 2022/03/23

写真a

 
ARAKI Yoshikazu
 
Organization
Graduate School of Environmental Studies Department of Environmental Engineering and Architecture Building Structure and Construction Systems Professor
Graduate School
Graduate School of Environmental Studies
Undergraduate School
School of Engineering Architecture
Title
Professor
Contact information
メールアドレス

Degree 1

  1. 博士(工学) ( 1998.3   京都大学 ) 

Research Areas 1

  1. Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Building structures and materials

Current Research Project and SDGs 1

  1. 南海トラフ地震に対する超高層建物の耐震安全性確保

Research History 1

  1. Kyoto University

    2000.4 - 2018.3

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    Country:Japan

Education 1

  1. Kyoto University   Graduate School, Division of Engineering

    - 1998.3

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    Country: Japan

Awards 2

  1. 先端技術大賞「産経新聞社賞」

    2018.7   フジサンケイビジネスアイ   大型単結晶超弾性合金の開発と制震構造への応用展開

    大森俊洋, 貝沼亮介, 喜瀬純男, 古河テクノマテリアル

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  2. 科研費審査員表彰

    2016.8   日本学術振興会  

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    Country:Japan

 

Papers 18

  1. Feasibility of roll threading superelastic Cu-Al-Mn SMA rods Invited Reviewed

    Kise, S., Kataoka, N., Takamatsu, R., Nishida, M., Omori, T., Kainuma, R., Araki, Y.

    ASCE Journal of Materials in Civil Engineering   Vol. 33 ( 04021254 ) page: 1 - 12   2021.7

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

    DOI: 10.1061/(ASCE)MT.1943-5533.0003874

  2. Rubble stone masonry buildings with cement mortar: base shear seismic demand comparison for selected countries worldwide Invited Reviewed International coauthorship

    Frontiers in Built Environment   Vol. 7 ( 647815 ) page: 1 - 27   2021.3

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

    DOI: 10.3389/fbuil.2021.647815

  3. Orientation dependence of plasticity and fracture in single crystal superelastic Cu-Al-Mn SMA bars Invited Reviewed

    Kise, S., Araki, Y., Omori, T., Kainuma, R.

    Journal of Materials in Civil Engineering   Vol. 33 ( 04021027 ) page: 1 - 12   2021.1

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

    DOI: 10.1061/(ASCE)MT.1943-5533.0003568

  4. Rubble stone masonry buildings with cement mortar: design specifications in seismic and masonry codes worldwide Reviewed

    Shildkamp, M, Silvestori, S, Araki, Y

    Frontiers in Built Environment   Vol. 6   2020.10

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

    DOI: 10.3389/fbuil.2020.590520

    Web of Science

    Scopus

  5. Chemical resistance of Cu-Al-Mn superelastic alloy bars in acidic and alkaline environment Reviewed

    Pareek, S, Kise, S, Yamashita, F, Gencturk B, Hosseini F, Brown S.A, Araki, Y

    ASCE Journal of Materials in Civil Engineering   Vol. 33   2020.10

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

    DOI: 10.1061/(ASCE)MT.1943-5533.0003478

  6. Experimental characterization and performance improvement evaluation of electromagnetic transducers by tuned inerter Reviewed

    Sugiura, K, Watanabe, Y, Asai, T, Araki, Y, Ikago, K

    Journal of Vibration and Control   Vol. 26 ( 1-2 ) page: 56 - 72   2020.1

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

    DOI: 10.1177/1077546319876396

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    Scopus

  7. Cost analysis of mountain schools in nepal: Comparison of earthquake resistant features in rubble stone masonry vs. Concrete block masonry Reviewed

    Schildkamp M

    Frontiers in Built Environment   Vol. 5   2019.4

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

    DOI: 10.3389/fbuil.2019.00055

    Scopus

  8. Reaction, Phases, and Microstructure of Fly Ash-Based Alkali-Activated Materials Reviewed

    Matsuda Akira, Maruyama Ippei, Meawad Amr, Pareek Sanjay, Araki Yoshikazu

    JOURNAL OF ADVANCED CONCRETE TECHNOLOGY   Vol. 17 ( 3 ) page: 93 - 101   2019.3

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

    DOI: 10.3151/jact.17.93

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    Scopus

  9. School buildings in rubble stone masonry with cement mortar in seismic areas: Literature review of seismic codes, technical norms and practical manuals Reviewed

    Shildkamp, M, Araki, Y

    Frontiers in Built Environment   Vol. 5   2019.2

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

    DOI: 10.3389/fbuil.2019.00013

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    Scopus

  10. Adhesion characteristics of geopolymer mortar to concrete and rebars Reviewed

    Pareek Sanjay, Kashima Hiroo, Maruyama Ippei, Araki Yoshikazu

    INTERNATIONAL CONFERENCE ON SUSTAINABLE CIVIL ENGINEERING STRUCTURES AND CONSTRUCTION MATERIALS (SCESCM 2018)   Vol. 258   2019

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1051/matecconf/201925801012

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  11. Plastic hinge relocation in reinforced concrete beams using Cu-Al-Mn SMA bars Reviewed

    S.Pareeka, Y.Suzuki, Y.Araki, M.A.Youssef, M.Meshalyd

    Engineering Structures   Vol. 175   page: 765 - 775   2018.11

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

    DOI: 10.1016/j.engstruct.2018.08.072

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    Scopus

  12. Enhancing the seismic performance of historic timber buildings in Asia by applying super-elastic alloy to a Chinese complex bracket system Reviewed

    Wenjun Xie, Yoshikazu Araki, Wen-Shao Chang

    International Journal of Architectural Heritage   Vol. 12 ( 4 ) page: 734 - 748   2018.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Taylor and Francis Inc.  

    Historic timber structures widely distributed in East Asia are suffering from the earthquakes. This article aims to develop a technique to enhance the seismic performance of historic timber buildings with the Dou-Gon system. High-strength steel bars and super-elastic alloy bars are used in this study to benchmark conventional Dou-Gon system that uses wood pegs to connect the base Dou and the column. Pushover tests were carried out under different loading conditions. The factors discussed in this study include vertical load imposed on the Dou-Gon system and the pre-strained levels of super-elastic bars. The results from this study has shown that the simple technique enhances the energy dissipation capacity and the ultimate strength of the base Dou-Gon system. Base Dou-Gon system with super-elastic alloy bar connections also show a better aseismic performance due to its constant damping behavior and longer fatigue life. Moreover, pre-strain of the super-elastic alloy bar provides a better damping behavior to the base Dou system.

    DOI: 10.1080/15583058.2018.1442528

    Scopus

  13. Mechanical splicing of superelastic Cu-Al-Mn alloy bars with headed ends

    S. Kise, A. Mohebbi, M. S. Saiidi, T. Omori, R. Kainuma, K. C. Shrestha, Y. Araki

    Smart Materials and Structures   Vol. 27 ( 6 )   2018.5

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

    © 2018 IOP Publishing Ltd. This paper examines the feasibility of mechanical splicing using a steel coupler to connect headed ends of superelastic Cu-Al-Mn alloy (Camalloy) bars and steel reinforcing bars to be used in concrete structures. Although threading of Camalloy is as easy as that of steel, mechanical splicing using threaded ends requires machining of Camalloy bars into dog-bone shape to avoid brittle fracture at the threaded ends. The machining process requires significant time and cost and wastes substantial amount of the material. This paper attempts to resolve this issue by applying mechanical splicing using steel couplers to connect headed ends of Camalloy and steel reinforcing bars. To study its feasibility, we prepare 3 specimens wherein both ends of each Camalloy bar (13 mm diameter and 300 mm length) are connected to steel reinforcing bars. The specimens are tested under monotonic, single-cycle, and full-cycle tension loading conditions. From these tests, we observed (1) excellent superelasticity with recoverable strain of around 6% and (2) large ductility with fracture strain of over 19%. It should be emphasized here that, in all the specimens, ductile fracture occurred at the locations apart from the headed ends. This is in sharp contrast with brittle fracture of headed superelastic Ni-Ti SMA bars, most of which took place around the headed ends. From the results of the microstructural analysis, we identified the following reasons for avoiding brittle fracture at the headed ends: (1) Precipitation hardening increases the strength around the boundary between the straight and headed (tapered) portions, where stress concentration takes place. (2) The strength of the straight portion does not increase significantly up to the ductile fracture if its grain orientation is close to 0 0 1.

    DOI: 10.1088/1361-665X/aabf0d

    Web of Science

    Scopus

  14. Structural control with tuned inertial mass electromagnetic transducers Reviewed

    Takehiko Asai, Yoshikazu Araki, Kohju Ikago

    Structural Control and Health Monitoring   Vol. 25 ( 2 )   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:John Wiley and Sons Ltd  

    This paper investigates the validity of the tuned inertial mass electromagnetic transducer (TIMET) applied to building structures subjected to seismic motions. The TIMET is a device inspired by two innovative structural control devices proposed recently, that is, tuned viscous mass damper and electromagnetic transducer. The TIMET consists of a spring, an inertial mass produced by a ball screw mechanism, and an electromagnetic transducer part composed of a motor and an electrical circuit. The stiffness of the spring is tuned such that the inertial mass resonates with the vibrating building. This makes the motor installed in parallel with the inertial mass run up in an efficient way, and the vibration energy is converted to electrical energy effectively. As a result, vibration of the building decays fast and electrical energy is stored. This generated energy that is reusable for the self-powered control systems, structural health monitoring, emergency power source, and so on. In this paper, through numerical simulation studies employing the scaled three-story building model proposed for benchmark studies, the vibration reduction and energy harvesting capabilities of the TIMET is explored and the application potentiality to civil structures is discussed.

    DOI: 10.1002/stc.2059

    Scopus

  15. Consistent DOF reduction of tall steel frames Reviewed

    Yoshikazu Araki, Masahito Ohno, Isoshi Mukai, Naoki Hashimoto

    Earthquake Engineering and Structural Dynamics   Vol. 46 ( 10 ) page: 1581 - 1597   2017.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:John Wiley and Sons Ltd  

    This paper presents an energy-consistent approach for reducing the number of degrees-of-freedom (DOFs) in tall steel frames. In the present approach, the moment resistance of beams and columns in each story is represented by the moment resistance of a rotational spring and a beam-column element, respectively. The shear resistance provided by braces in each story is represented by the shear resistance of a shear spring. Furthermore, the resistance to the overturning moment provided by axial resistance of columns in each story is represented by the moment resistance of a rotational spring. These representations are carried out by achieving the equivalence between the strain energy stored and dissipated in the elements in the full (unreduced) DOF models and the strain energy stored and dissipated in the corresponding elements in the reduced DOF models. The accuracy of the present approach is demonstrated through numerical examples, which compare the results of nonlinear time history analyses obtained using the full and reduced DOF models. In the numerical examples, the response is estimated for 20-story and 40-story steel frames with and without buckling-restraint braces subjected to a suite of near-fault and far-fault ground motions. The present approach is useful in estimating the response of tall steel frames having non-regular member arrangements to a suite of intense ground motions including near-fault ones, where it is crucial to capture the influence of higher mode effects on collapse mechanisms. Copyright © 2017 John Wiley &amp
    Sons, Ltd.

    DOI: 10.1002/eqe.2870

    Scopus

  16. Ultra-large single crystals by abnormal grain growth Reviewed

    Tomoe Kusama, Toshihiro Omori, Takashi Saito, Sumio Kise, Toyonobu Tanaka, Yoshikazu Araki, Ryosuke Kainuma

    NATURE COMMUNICATIONS   Vol. 8 ( 354 )   2017.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATURE PUBLISHING GROUP  

    Producing a single crystal is expensive because of low mass productivity. Therefore, many metallic materials are being used in polycrystalline form, even though material properties are superior in a single crystal. Here we show that an extraordinarily large Cu-Al-Mn single crystal can be obtained by abnormal grain growth (AGG) induced by simple heat treatment with high mass productivity. In AGG, the sub-boundary energy introduced by cyclic heat treatment (CHT) is dominant in the driving pressure, and the grain boundary migration rate is accelerated by repeating the low-temperature CHT due to the increase of the sub-boundary energy. With such treatment, fabrication of single crystal bars 70 cm in length is achieved. This result ensures that the range of applications of shape memory alloys will spread beyond small-sized devices to large-scale components and may enable new applications of single crystals in other metallic and ceramics materials having similar microstructural features.

    DOI: 10.1038/s41467-017-00383-0

    Web of Science

  17. Adjustable vertical vibration isolator with a variable ellipse curve mechanism Reviewed

    Takehiko Asai, Yoshikazu Araki, Kosuke Kimura, Takeshi Masui

    Earthquake Engineering and Structural Dynamics   Vol. 46 ( 8 ) page: 1345 - 1366   2017.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:John Wiley and Sons Ltd  

    This paper presents a passive vertical quasi-zero-stiffness vibration isolator intended for relatively small objects. The present isolator has features of compactness, long stroke, and adjustability to various load capabilities. To realize these features, we use constant-force springs, which sustain constant load regardless of their elongation, and propose a variable ellipse curve mechanism that is inspired by the principle of ellipsographs. The variable ellipse curve mechanism can convert the restoring force of the horizontally placed constant-force springs to the vertical restoring force of the vibration isolator. At the same time as converting the direction, the vertical restoring force can be adjusted by changing the ratio of the semi-minor axis to the semi-major one of the ellipse. In this study, a prototype of a class of quasi-zero-stiffness vibration isolator with the proposed variable ellipse curve mechanism is created. Shaking table tests are performed to demonstrate the efficacy of the present mechanism, where the prototype is subjected to various sinusoidal and earthquake ground motions. It is demonstrated through the shaking table tests that the prototype can reduce the response acceleration within the same specified tolerance even when the mass of the vibration isolated object is changed. Copyright © 2017 John Wiley &amp
    Sons, Ltd.

    DOI: 10.1002/eqe.2859

    Scopus

  18. Energy harvesting potential of tuned inertial mass electromagnetic transducers Reviewed

    Takehiko Asai, Yoshikazu Araki, Kohju Ikago

    MECHANICAL SYSTEMS AND SIGNAL PROCESSING   Vol. 84   page: 659 - 672   2017.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD  

    The demand for developing renewable energy technologies has been growing in today's society. As one of promising renewable energy sources, large-scale energy harvesting from structural vibrations employing electromagnetic transducers has recently been proposed and considerable effort has been devoted to increase the power generation capability. In this paper, we introduce the mechanism of a tuned inertial mass electromagnetic transducer (TIMET), which can absorb vibratory energy more efficiently by tuning the parameters to adjust the system. Then we propose a new vibratory energy harvester with the TIMET and determine the parameter values for the device with a simple static admittance (SA) control law to maximize the energy harvested from a stationary stochastic disturbance. To investigate the energy harvesting potential of the TIMET further, the performance -guaranteed (PG) control and the LQG control proposed in the literature are applied as well. Then the numerical simulation studies are carried out and the effectiveness of the proposed energy harvester is examined by comparing the traditional electromagnetic transducers. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ymssp.2016.07.048

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KAKENHI (Grants-in-Aid for Scientific Research) 6

  1. 超高層の耐震設計に死角はないか?―漸増ねじれ倒壊とそのカラクリ―

    2020.4 - 2023.3

    科学研究費補助金  基盤研究(A)

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    Authorship:Principal investigator 

  2. 単結晶形状記憶合金大型部材の力学

    2017.6 - 2019.3

    科学研究費補助金  研究成果公開促進費 (研究成果公開発表)

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    Authorship:Principal investigator 

  3. 2015年ネパール・ゴルカ地震で被災した学校建物の復旧技術に関する調査研究

    2017.4 - 2021.3

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  4. 無機新材料の利用を核とするコンクリート系複合材料・部材・補修補強技術の開拓と展開

    2016.4 - 2019.3

    科学研究費補助金  基盤研究(A)

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    Authorship:Principal investigator 

  5. 無機新材料を用いたコンクリート系複合材料・部材のマルチスケール力学モデル構築

    2016 - 2020.3

    科学研究費補助金 

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    Authorship:Principal investigator 

  6. Development of energy harvesting technique from large scale structural vibration using large mass ratio TMD

    Grant number:26630256  2014.4 - 2018.3

    Araki Yoshikazu

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    This study proposes tuned inertial mass electromagnetic transducers, wherein rotational inertial mass, spring, and motor are connected in series. Through numerical simulations and experiments, the effectiveness of the proposed device has been demonstrated in terms of both vibration reduction and energy harvesting efficiency.

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