【摘要】 反应谱控制周期是调整地震动记录时拟合目标谱所须考虑的关键因素之一,而目前的抗震设计规范对此还缺乏统一的定量依据。针对该问题,该文通过对不同周期对应的加速度反应谱向量与结构最大层间位移角进行相关性分析,初步讨论了对结构非线性地震反应有重要贡献的反应谱的周期特征,并引入反应谱形参数1 2T,TR,对Sa(T1)的控制作用进行解耦,最后结合大量的统计分析和归一化处理,建议了地震动记录调整中所需要控制的关键周期范围。分析结果表明:对于低层结构,结构基本周期已能基本满足要求;对于中高层结构,0.2T1~2T1是比较合适的控制周期范围。更多还原

【Abstract】 It is well-established that the spectral period range is one of the critical considerations in ground motion scaling. However, there is no consensus and quantitative basis in current codes for seismic design of buildings. In the paper, first of all, correlation analyses are carried out between acceleration spectrum corresponding to different periods and structural non-linear seismic responses. The preliminary spectral period range is discussed, which makes a significant contribution to the structural non-linear seismic response. Then, based on extensive statistics analysis and normalization processing, the parameter proxy of spectral shape 1 2T,TR is introduced to decouple the control action of Sa(T1). Finally, some suggestions are presented to determine the range for scaling ground motions. The results show that the fundamental period could meet basically the requirement of low-rise buildings, in addition, 0.2T1~2T1 is adequate for medium- and high-rise buildings.更多还原