长周期结构弹塑性时程分析的地震波选取

长周期结构在大震作用下进入弹塑性状态，结构刚度退化，周期延长，地震波对应的反应谱与规范反应谱在长周期段的拟合程度对结构的安全性判断有较大影响。提出长周期反应谱拟合系数作为长周期结构在弹塑性时程分析中地震波选取的依据，通过六千多条强震记录的统计分析，得到不同场地条件下适用于长周期结构弹塑性时程分析的地震波库，保证所选取地震波对应的反应谱与规范反应谱在3~6s段统计意义上相一致。

Ground motion selection for elasto-plastic time-history analysis of long-period structure

Long-period structures may go into elasto-plastic state due to strong earthquakes with structural stiffness degraded andperiod prolonged. The fitting degree between seismic response spectrum and the response spectrum of Structure Seismic Design Codes inthe long period may have a great influence on the judgment of structural safety. In this study, the fitting coefficient for long-periodresponse spectrum may be referred during the ground motion selection for elasto-plastic time-history analysis of long-period structure.Based on the statistical analysis of six thousands of strong ground motion records, we can obtain seismic wave library, which issuitable for elasto-plastic time-history analysis of long-period structure in different site conditions. In the obtained seismic wavelibrary, the response spectrum of the selected seismic waves can be guaranteed to be consistent with the response spectrum in codeduring the period of 3~6s.