合理选取四类场地320条强震记录，研究地震动特性及恢复力模型动力参数对弹塑性位移谱与残余位移谱影响。结果表明，给出某一标准设防烈度的弹塑性反应谱，其它设防烈度下弹塑性反应谱可据PGA设防烈度与PGA标准烈度比值调整获得；可忽略屈服后刚度比对弹塑性位移谱影响，但应选择偏于保守的屈服后刚度比统计残余位移谱，由此建立的残余位移谱只适用短周期、低延性一般规则桥梁中、低矮桥墩的抗震设计；阻尼比与位移延性比为影响弹塑性位移谱及残余位移谱重要因素，阻尼比增大会减少桥梁非弹性变形及震后残余位移。基于该结果建立适用于我国梁式桥抗震设计的弹塑性及残余位移谱，为考虑残余位移影响的梁式桥基于性能的抗震设计提供重要参考依据。
Abstract
320 Strong motion records of four sites are appropriately selected. The elasto-plastic dynamic analysis program is used to research the effects of characteristics of earthquake motion and dynamic parameters of restoring model on elasto-plastic displacement spectra and residual displacement spectra. The study results are obtained as follow: 1) Elasto-plastic response spectra of other protected earthquake intensity can be obtained by adjusting elasto-plastic response spectra of the standard protected earthquake intensity according to the ratio of PGA (protected earthquake intensity) to PGA (standard protected earthquake). 2) Effects of yielding rigidity ratio on elasto-plastic displacement spectra can be neglected. But conservative yielding rigidity ratio is chosen to establish residual displacement spectra which can be applied in low and medium-height piers of general regular bridge with short natural period and low ductility. 4) Elasto-plastic displacement spectra and residual displacement spectra are affected obviously by both damping ratio and ductility. And, the elasto-plastic displacement and residual displacement can be decreased by increasing damping ratio. Based on conclusions above, elasto-plastic displacement spectra and residual displacement spectra, which is applicable in seismic design for Chinese bridge, are established. So, some meaningful references are provided for performance-based seismic design for bridge considering residual displacement.
关键词
弹塑性反应谱 /
抗震设计 /
地震动峰值加速度 /
屈服后刚度 /
延性
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Key words
elasto-plastic response spectra /
seismic design /
PGA /
yielding rigidity /
ductility
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