Faculty Profiles - HIBINO, Yo

Papers - HIBINO, Yo

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RESPONSE OF BUILDING ISOLATED WITH SLIDING BEARINGS UNDER STRONG GROUND MOTION -A study based on Rigid-Plastic theory- Reviewed Open Access

Yo HIBINO and Toshikatsu ICHINOSE

Journal of Structural Engineering Vol. 53B page： 17-23 2007.3

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

We conducted dynamic response analyses to study the response of base-isolated two-story house under strong ground motions.
We used two kinds of input waves: rectangular-shaped wave and real seismic records. We used a bilinear model to represent the isolation system and the upper stories. The response of the Rigid-Plastic model was similar to that of the bilinear model. The following criteria were derived from the Rigid-Plastic theory: 1) No story or isolation system deforms; 2) Only isolation system deforms; 3) Only upper structure deforms; 4) Both upper structure and isolation system deform. The criteria were effective to approximately classify the results of the response analyses.

Open Access

CRITERIA TO PREDICT THE STORY WHERE PLASTIC DRIFT DOMINATES IN TWO-STORY STEEL BUILDING UNDER STRONG GROUND MOTION Reviewed Open Access

Yo Hibino and Toshikatsu ICHINOSE

Journal of structural and construction engineering ( 606 ) page： 105-111 2006.8

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

The objective of this paper is to establish criteria using which one can predict the story where plastic drift dominates in two-story steel building under strong ground motion. The dynamic response analyses were conducted for Elasto-Plastic and Rigid-Plastic models. The following conclusions are obtained for the response of Rigid-Plastic model. 1) If the shear coefficient of the 2nd story exceeds the base shear coefficient, the plastic drift occurs only in the 1st story. 2) Otherwise, the plastic drift occurs also in the 2nd story. The story of which plastic drift dominates can be predicted considering the story shear coefficient, the peak ground acceleration and the mass distribution of structure as shown in Fig. 12. Similar conclusions are obtained for Elasto-Plastic model if the story shear coefficients are small enough.

DOI： 10.3130/aijs.71.105_2

Open Access

RC骨組の地震時塑性率に及ぼす柱梁耐力比の影響 Reviewed Open Access

日比野陽, 市之瀬敏勝

コンクリート工学年次論文集 Vol. 27 ( 2 ) page： 85-90 2005.6

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

RC 骨組について地震応答解析を行い，柱梁耐力比が柱や梁の塑性率に及ぼす影響について考察した。層数や柱と梁の強度，地震動，階高をパラメータとし，柱の塑性化分布から層崩壊機構を防ぐために必要な柱梁耐力比を求めた。解析結果から次の結論を得た。(1) 明確な弱点階を有する建物であっても，層崩壊機構を防ぐための柱梁耐力比の上限は存在する。(2) 最大速度1.0m/s 程度の地震波において，明確な弱点階を有する建物の層崩壊機構を防ぐための柱梁耐力比は，弱点階を有しない建物で必要な柱梁耐力比より0.4～0.6 程度大きい。(3) 層崩壊機構を防ぐための柱梁耐力比は，建物の強度分布が同じである場合には，地震力の大きさに影響を受ける。

Open Access

EFFECTS OF COLUMN-TO-BEAM STRENGTH RATIO ON SEISMIC ENERGY DISTRIBUTION IN STEEL FRAME STRUCTURES Reviewed Open Access

Yo HIBINO and Toshikatsu ICHINOSE

Journal of Structural Engineering Vol. 51B page： 277-284 2005.3

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

This paper presents a numerical study on the column-to-beam strength ratio that affects the seismic energy dissipation of beams and columns in fish-bone-type steel moment frames. The major parameters are number of stories, strengths of columns and beams, and ground motions. The seismic energy dissipation is classified into two categories: energies contributing to story mechanism and total mechanism. The following conclusions are obtained: (1) It is suitable for the column-to-beam strength ratio to be defined by the total of the strength of the beams and columns at a node for evaluating the seismic response; (2) As the column-to-beam strength ratio increases from 1 to 1.3, the energies contributing to story mechanism decreases significantly in the most cases.

Open Access

New Method for Estimating Seismic Response of Frame Structures Considering Collapse Mechanism Reviewed

Yo HIBINO, Hisashi UMEMURA, Toshikatsu ICHINOSE

Proceedings of the 13th World Conference on Earthquake Engineering page： 2357 2004.8

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

For seismic performance-based design, it is important to evaluate structural performance for various seismic excitations. The absorbed energy in a structure, which is closely related to the seismic damages, can be an index to evaluate a building by performance. The energy attributed to the total and collapse mechanisms were evaluated for RC and steel frame structures under 84 ground motions and were
compared each other to study energy demand on structure. The maximum drifts gained by dynamic response analyses were compared with the cumulative plastic story drifts evaluated from energy. Then, a factor which indicates the relationships between cumulative plastic story drifts and dynamic responses were obtained. The estimation method was presented using the factor and its applicability was evaluated.

PROBABILISTIC ESTIMATION OF SEISMIC RESPONSE OF BUILDINGS CONSIDERING UNCERTAINTY OF COLLAPSE MODE Reviewed

Nanako Marubashi, Yo Hibino, Hisashi Umemura, Toshikatsu Ichinose

Proceedings of the ninth East Asia-pacific conference on Structural Engineering and Construction page： MCS-1-MCS-6 2003.12

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

This paper estimates the effect of strength deterioration on the seismic response of reinforced concrete (RC) structures with a weak story. Strength deteriorates because of partial failure or the P-delta effect. In particular structures with weak stories tend to collapse accompanied by strength deterioration. The story with strength deterioration cannot consume much cumulative plastic energy, thus exhibiting large-scale deformations. We predicted the capacity of the cumulative plastic energy of the story through the number of reversed cycles of shear force. The numbers of reversed cycles are related to the duration of the input ground motions. Therefore, we selected ground motions with various durations while the coefficient of strength degradation is selected as a structural parameter. And we examined the seismic response of structures with a weak story. The structures are designed using the "story-shear-safety factor" which represents the capacity against story collapse. As a result, the relation between the duration and the reversed cycle was formulated. We then proposed an effective method to predict the capacity of cumulative plastic energy by using the formula.

EVALUATION OF SEISMIC RESPONSE FOR BUILDINGS USING STORY-SHEAR-SAFETY FACTOR BASED ON ENERGY PRINCIPLE Reviewed

Yo Hibino, Nanako Marubashi, Hisashi Umemura, Toshikatsu Ichinose

Proceedings of the ninth East Asia-pacific conference on Structural Engineering and Construction page： VID-97-VID-102 2003.12

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

It is important to estimate the response of buildings under earthquakes from the viewpoint of life reservation and risk management. This paper presents a method to estimate the story drifts of both RC and steel buildings using a story-safety factor (SSF) based on the energy concept. In this paper, the method was verified by dynamic response analyses of RC and steel structures with various conditions. The method predicted the mean of story drifts well irrespective of the differences in the models used.

DEVELOPMENT OF EDUCATIONAL SOFTWARE FOR STRUCTURAL MECHANICS Reviewed Open Access

Naoya WAKITA, Yo HIBINO, Tomoharu HAYASE, Toshikatsu ICHINOSE

Journal of Architecture and Building Science ( 17 ) page： 525-530 2003.6

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

Computer software for structural mechanics was developed to improve education of structural mechanics. A new lecture style was proposed using this software and accompanying manuals. This software visualizes mechanics including bending moment, axial or shear force and so on. Each student can easily understand these concepts through virtual experiment on computer changing the location or the magnitude of force as if he or she was loading forces on a real structure. Results of questionnaire proved that this software is effective for studying structural mechanics.

DOI： 10.3130/aijt.9.525

Open Access

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