Estimation and Evaluation of Torsional Earthquake Response of Asymmetric Buildings

本研究对以下内容进行了实验和分析研究。(1)首先，针对非对称结构的强度偏心率作为振动台试验参数进行了研究。试验结果表明，强度偏心对结构的破坏形态和动力特性有显著影响。(2)在此基础上，建立了考虑刚度偏心和强度偏心的既有结构模型，并基于能力谱法对模型进行了简化计算。为了验证所提出的方法，计算了等效单自由度系统的响应，并与多自由度系统的结果进行了比较。(3)提出了偏心框架扭转地震反应的计算方法，并对偏心框架抗震设计中的关键问题进行了讨论。

In this research, the experimental and analytical studies on the following contents have made.(1) First, the strength eccentricity of asymmetric building structures was focused as the parameter for shaking table test. According to the test result, it is revealed that the strength eccentricity significantly affects the failure mode and dynamic behavior of building.(2) Considering results from the preliminary studies above, an existing building is modeled considering strength eccentricity as well as stiffness eccentricity, and the torsional response of the model building is simulated through a simplified procedure, which is based on the capacity spectrum method. To verify the proposed procedure, the response of an equivalent SDOF system is computed and compared with results obtained through MDOF system.(3) The procedure of estimating the torsional earthquake response of frames with eccentricity is proposed, and key issues on seismic design for buildings concerned in this study is discussed.