中文摘要：

为了研究地震动参数与大跨度刚构桥梁结构损伤的相关性,选取了国内外355条地震动记录,并从现有文献中选择了29个具有代表性的地震动参数来做相关性分析。以一座典型的高墩大跨连续刚构桥为工程背景,采用OpenSees作为动力分析平台,建立能够考虑材料刚度退化的非线性有限元分析模型,通过回归分析,建立各地震动参数独立的概率性地震需求模型,得到地震动强度与桥梁结构最大响应（墩底单元曲率以及墩顶和支座的位移）和桥梁损伤之间的相关性,并且对不同地震动强度指标进行分析和比较。结果表明：不同地震动强度指标与桥梁响应和损伤的相关性差别很大,其中峰值速度（PGV）、持续最大速度（SMV）、反应谱速度峰值、Housner强度与结构响应有很高的相关性,1s周期对应的谱参数、峰值速度（PGV）、Arias强度以及Housner强度与结构损伤有很高的相关性;而峰值加速度PGA、峰值加速度与峰值速度的比值、位移均方根值以及卓越周期与桥梁结构最大响应和结构损伤的相关性较差;对于周期较长的大跨度刚构桥,推荐使用PGV等具有较好相关性的地震动强度指标进行地震易损性分析和地震风险评估。

英文摘要：

In order to investigate the correlation between intensity measures of ground motion and the damage of large span rigid frame bridge,355 ground motions records abroad and at home were selected,and 29 representative intensity measures in the literatures were chosen to carry out correlation analysis.Taking a typical large continuous span rigid frame bridge with high piers as a case study,the nonlinear finite element model of this bridge was then built,considering the stiffness degradation of materials based on the OpenSees as dynamic analysis platform.By using the regression analysis method,the probabilistic seismic demand model for each intensity measure was established,and the correlation between the ground motion intensity and the maximum response（the unit curvature of the bottom of the pier and the displacements of the pier and the support）of the bridge structure and the bridge damage was obtained.On this basis,the differentground motion intensity measures were evaluated and compared.The results show that there is a large difference in the correlation between different ground motion intensity indices and bridge response and damage.It is concluded that peak ground velocity（PGV）,sustained maximum velocity（SMV）,peak velocity of response spectra and Housner intensity have the best correlation with bridge responses,and spectral parameters,PGV,Arias intensity and Housner intensity corresponding to 1scycles have the best correlation with the damage.The following intensity measures,namely peak ground acceleration（PGA）,the ratio of PGA to peak ground velocity（PGA/PGV）,displacement RMS and predominant period,demonstrate poor correlations with the Maximum seismic response and damage of bridges.It is recommended to use the ground motion intensity measures like PGA which have a good correlation with response and damage for seismic fragility analysis and seismic risk assessment for long span rigid frame bridges with long cycle.