【摘要】 以国内常见的中小跨径混凝土连续梁桥为对象,考虑了桥墩、板式橡胶支座构件损伤,对桥梁系统进行了地震易损性分析。在桥梁易损性分析中,使用了超拉丁方抽样技术形成桥梁样本,从太平洋地震工程研究中心数据库中选取了大量地震波作为地震动输入样本,以桥墩漂移率、支座相对变形作为损伤指标,并对损伤指标予以了量化。在计算得到桥梁构件易损性曲线的基础上,使用一阶可靠度理论形成了桥梁系统易损性曲线的上下界限,并得出了桥梁不同损伤状态对应的具有统计意义的中位值地震动强度。研究结果对于在役的同类型桥梁抗震加固设计及地震灾害损失评估提供了理论依据。更多还原

【Abstract】 Selecting the common medium and small sized concrete continuous girder bridges in China as research objects,the fragility of the bridge system is analyzed.In the fragility analysis,Hyper-Latin cube is used for the sampling of the bridges,the earthquake motion records are selected from the database of Pacific Earthquake Research Centre as input samples of earthquake motion,the pier drift ratio and bearing relative displacement are defined as damage indexes and quantified.Based on the calculated bridge component fragility curves,first-order reliability theory is implemented to give the upper and lower bounds of the fragility curves of bridge system and to obtain the statistical median of ground motion intensity for different bridge damage statuses.The research result provides a theoretic foundation for the similar as-built bridges for seismic rehabilitation design and earthquake loss risk evaluation.更多还原