Effects of aftershocks on peak ductility demand due to strong ground motion records from shallow crustal earthquakes
Effects of aftershocks on peak ductility demand due to strong ground motion records from shallow crustal earthquakes
复制标题
DOI：
10.1002/eqe.2188
复制
发表时间：
2012-12
影响因子：
4.5
通讯作者：
K. Goda;Colin A. Taylor
中科院分区：
文献类型：
--
作者：
K. Goda;Colin A. Taylor
大型主震引发的余震可能会对建筑物和基础设施造成额外损坏，从而阻碍灾后建筑物的重新使用和恢复活动。为了评估余震造成的非线性损害潜力，本研究通过使用真实的和人工生成的主震-余震序列来研究余震的影响。真实的主震-余震序列由太平洋地震工程研究中心—全球浅层地壳地震下一代衰减数据库构建；然而，由于记录缺失，它们被认为是不完整的。为了补充不完整的真实数据集，根据广义大森定律生成人工序列，然后设计合适的余震记录选择程序来模拟主震-余震序列的时间序列数据。使用真实序列和人工序列对非弹性单自由度系统进行非线性动力分析的结果表明，使用真实序列的余震对峰值延性需求的增量影响相对较小，并且基于广义大森定律的峰值延性需求估计值比真实序列的峰值延性需求估计更大，特别是在上尾部。基于广义大森定律的结果还表明，由于真实数据集的不完整性，基于真实序列的余震影响可能会低估余震影响。版权所有 © 2012 约翰·威利父子有限公司
Aftershocks induced by a large mainshock can cause additional damage to structures and infrastructure, hampering building reoccupation and restoration activities in a post‐disaster situation. To assess the nonlinear damage potential due to aftershocks, this study investigates the effects of aftershocks by using real as well as artificially generated mainshock–aftershock sequences. The real mainshock–aftershock sequences are constructed from the Pacific Earthquake Engineering Research Center—Next Generation Attenuation database for worldwide shallow crustal earthquakes; however, they are deemed to be incomplete because of missing records. To supplement incomplete real dataset, artificial sequences are generated on the basis of the generalized Omori's law, and a suitable aftershock record selection procedure is then devised to simulate time‐series data for mainshock–aftershock sequences. The results from nonlinear dynamic analysis of inelastic single‐degree‐of‐freedom systems using real and artificial sequences indicate that the incremental effects of aftershocks on peak ductility demand using the real sequences are relatively minor and that peak ductility demand estimates based on the generalized Omori's law are greater, particularly in the upper tail, than those for the real sequences. The results based on the generalized Omori's law also suggest that the aftershock effects based on the real sequences might underestimate the aftershock impact because of the incompleteness of the real dataset. Copyright © 2012 John Wiley & Sons, Ltd.