用增量动力分析方法求解人字形中心支撑钢框架的结构影响系数和位移放大系数(Ⅰ)——方法

Response modification factor and displacement amplification factor for inverted V-CBSFs based on IDA(Ⅰ):Method

结构影响系数是基于强度的抗震设计中确定设计地震作用的关键,也是基于性态抗震设计理论的基础。位移放大系数则是根据结构的弹性位移估算弹塑性位移的关键参数。本文采用增量动力分析方法求解结构影响系数和位移放大系数,并结合具体算例详细说明了基于增量动力分析求解结构影响系数和位移放大系数的实施步骤。该方法能反映结构的动力特征,并能考虑高阶振型对结构抗震性能的影响。

Response modification factor（R）is the key for determining the earthquake action in the seismic design based on strength,and also is the base of the performance based seismic design.Displacement amplification factor （Cd）is the critical parameter to estimate the elasto-plastic displacement based on elastic displacement of the structures.In this paper,the incremental dynamic analysis（IDA）method is introduced to calculate R and Cd ,and a specific example is adapted to explain how to compute R and Cd based on IDA.This method can reflect the dynamic feature and account for the influence of higher mode on the earthquake resistant capability of the structures.