掲載雑誌（和）： 日本地震工学シンポジウム講演集 Vol： 4巻 年： 1975年 頁： 919-926頁 著者（和）： - タイトル（和）： - 抄録（和）：
- キーワード（和）： - 掲載雑誌（英）： PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM 著者（英）： Haruo TAKIZAWA, Manabu YOSHIMURA タイトル（英）： BI AXIAL EFFECT OF FLEXURAL MEMBERS ON THE STRONG-MOTION RESPONSE OF R/C STRUCTURES 抄録（英）：
Recent studies reveal that R/C structural members subjected to bi-axial flexure due to two-dimensional earthquake excitation can deform much more than would be predicted by conventional one-dimensional response analysis. The biaxial flexure may therefore have a significant effect on the dynamic collapse process of structures subjected to intense ground motions. The present paper is intended to summarize briefly the authors' formulation of two-dimensional restoring force characteristics of R/C columns acted upon by bi-axial bending moments (Ref, 1), and their discussion of the dynamic response for the case where the columns play the most important role in the overall restoring force characteristics of the structure (Refs. 1 and 2). The model proposed is a two-dimensional extension of various non-linear models for one-dimensional response analysis, including the degrading tri-linear stiffness model, which is one of the simpler idealizations of the restoring force characteristics of R/C structures. The model developed enables one to analyze the two-dimensional column behavior in response to any static or dynamic loading history of bi-axial flexure. The modeling validity was then examined by comparison with experimental data on the inelastic behavior of R/C column specimens acted upon by static bi-axial load. It was shown that the proposed model explains the trends of test results fairly well. By the same technique used to construct this model, bi-linear and non-degrading tri-linear models can be also extended into the corresponding two-dimensional models. The calculated response of these three different models subjected to two-directional strong ground motion, including an ensemble of computergenerated artificial accelerograms, has revealed that the bi-axial effect is very significant and, in some cases, critical in case of R/C structures with stiffnessdegrading properties. The effect is not so conspicuous in non-degrading inelastic cases, I.e., in the non-degrading bi-linear and tri-linear models. It is pointed out that the critical cases apparently occur near the transition region from elasticity to extreme plasticity. From the viewpoint of aseismic design of R/C structures, more attention should be paid to the inelastic bi-axial effect for ductility factors in the neighborhood of 2 to 3. キーワード（英）： - 記事区分： - 区分 　　　委員会論文集