Abstract To facilitate the rapid, though, reliable assessment of mainshock-damaged structures against the succeeding aftershock excitations, the γ-index is introduced, defined as the ratio of the residual displacement of a structure under the mainshock excitation over the aftershock-induced maximum inelastic displacement of the damaged structure. Over 200 mainshock-aftershock sequences from very dense and stiff soil profiles were chosen to perform nonlinear response history analyses of single degree of freedom systems and the influence of structural, strong ground motion and site-specific parameters on the γ-index was assessed. An equation for the γ-index is proposed to predict the performance of the damaged structure under aftershocks.

中文翻译：

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后续余震作用下主震损伤结构的最大非弹性位移

摘要 为了便于对受后续余震激发的主震损坏结构进行快速、可靠的评估，引入了 γ 指数，定义为结构在主震激发下的残余位移与余震引起的最大非弹性位移之比。损坏结构的位移。选择了来自非常密集和坚硬的土壤剖面的 200 多个主震 - 余震序列来执行单自由度系统的非线性响应历史分析，并评估结构、强地面​​运动和场地特定参数对 γ 指数的影响。提出了一个γ-指数方程来预测余震下受损结构的性能。