論文 - 日比野　陽

鋼構造骨組の地震時塑性エネルギー分布に及ぼす柱梁耐力比の影響 査読有り

日比野陽, 市之瀬敏勝

構造工学論文集   51B 巻   頁： 277-284   2005年3月

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担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）  

全階ほぼ均等な中低層魚骨型鉄骨骨組で，遠方型および直下型の地震波に対する応答解析を行い，次の結論を得た。1. 柱梁耐力比は，ACI 基準および冷間成形角形鋼管設計・施工マニュアルのように節点の上下左右の柱梁強度の和で定義するのが適当である。2. 上記の定義による柱梁耐力比が1 を超えると，柱の強度分布や層の位置にかかわらず層降伏エネルギーが減少し始める。特に，1階での減少が急激である。従来の動的増幅係数では，周期の長い建物の高層部で大きな増幅率が要求されるが，エネルギーの面から見る限りでは，そのような傾向は見られなかった。

New Method for Estimating Seismic Response of Frame Structures Considering Collapse Mechanism 査読有り

Yo HIBINO, Hisashi UMEMURA, Toshikatsu ICHINOSE

Proceedings of the 13th World Conference on Earthquake Engineering     頁： 2357   2004年8月

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

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.

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

Yo Hibino, Nanako Marubashi, Hisashi Umemura, Toshikatsu Ichinose

Proceedings of the ninth East Asia-pacific conference on Structural Engineering and Construction     頁： VID-97-VID-102   2003年12月

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

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.

PROBABILISTIC ESTIMATION OF SEISMIC RESPONSE OF BUILDINGS CONSIDERING UNCERTAINTY OF COLLAPSE MODE 査読有り

Nanako Marubashi, Yo Hibino, Hisashi Umemura, Toshikatsu Ichinose

Proceedings of the ninth East Asia-pacific conference on Structural Engineering and Construction     頁： MCS-1-MCS-6   2003年12月

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

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.

構造力学教育ソフトウェアの開発 査読有り

脇田直弥, 日比野陽, 早瀬友晴, 市之瀬敏勝

日本建築学会技術報告集   ( 17 ) 頁： 525-530   2003年6月

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

建築構造教育の問題解決方法として，梁の曲げ仮想実験プログラムをはじめとする構造力学教育ソフトウェアを6種類開発し，その使用方法の提案を行った。ソフトウェアを使用した授業は，仮想的な実験を取り入れた授業であり，構造力学の理解を深める上で有効であった。