实际偏心结构平扭耦合地震反应分析

ANALYSIS OF THE COUPLING RESPONSE BETWEEN TRANSLATION AND TORSION UNDER EARTHQUAKE OF ACTUAL ASYMMETRIC STRUCTURE

结构的偏心距对结构的抗震性能有较大的影响,对偏心结构的地震响应作了详细深入的分析。通过列举两种实际结构,建立了单层偏心结构在地震作用下的平扭耦联运动方程,并采用Rayleigh阻尼,应用时程分析法,对结构进行线弹性分析,解出在不同偏心率和刚度比时结构模型的动力特性和地震反应,最后得出一些有用的结论,可为结构地震扭转效应的工程计算和设计提供参考。

Linear eccentricity of a structure has great influence on aseismatic performance of the structure. Datalied and deep analysis of seismic response of eccentric structure has been made . It is enumerated two kinds of actual structures and is also established the momentum differentiating equation of coupling between the translation and torsion of single layer of asymmetric structure under earthquake. By adopting Rayleigh＇s damping model and using time-history analysis （Wilson-θ Method）, the linear elastic analysis of the structure was made, and the earthquake response and dynamic characteristics of the structure model were calculated under different eccentricity ratio and stiffness ratio. Finally, some valuable conclusions were drawn, which can supply references to engineering calculation and design of structural torsional response under earthquake.