跨断层简支钢箱梁桥的概率性地震损伤特性研究  

Probabilistic seismic damage characteristics of simply supported steel box girder bridge across fault

作　　者：江辉[1,2] 张鹏 黄磊 曾聪 JIANG Hui;ZHANG Peng;HUANG Lei;ZENG Cong(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;State Key Laboratory for Track Technology of High-speed Railway,China Academy of Railway Sciences,Beijing 100081,China;Guangzhou Municipal Office for Managing Bulk Cement,Guangzhou 510032,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]高速铁路轨道技术国家重点实验室(中国铁道科学研究院),北京100081 [3]广州市散装水泥管理办公室,广州510032

出　　处：《振动与冲击》2021年第15期253-262,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(51727813,51378050);高等学校学科创新引智计划(“111计划”)(B13002);北京市自然科学基金(8192035);高速铁路轨道技术国家重点实验室(中国铁道科学研究院)开放课题基金(2019YJ193)。

摘　　要：以跨越走滑断层的简支钢箱梁桥为对象,同时考虑地震动和结构参数不确定性的影响,开展全桥结构在非一致激励下的增量动力分析,深入讨论了跨断层桥梁桥墩的概率性地震损伤特性。结果表明,结构参数不确定性的影响随着地震动增强而变大;对于紧邻断层桥墩,当断层滑冲强度为78.0 cm时,完全破坏的超越概率由均值模型的7.53%增大到随机模型的13.01%,说明强震下如不考虑结构参数不确定性的影响可能会低估结构的易损性。紧邻断层桥墩面临更高的地震损伤概率,当断层滑冲强度为52.0 cm时,四种损伤状态下非紧邻断层墩的超越概率分别为97.54%、88.51%、2.42%和0.06%,而紧邻断层墩分别为99.24%、99.15%、6.50%和0.28%。因此,应对跨断层桥梁紧邻断层桥墩的抗震设计予以更多关注,开展针对性抗震设计。Taking a simply supported steel box girder bridge across strike slip fault as the study object,simultaneously considering effects of uncertainty of ground motion and structural parameters,the incremental dynamic analysis(IDA)of the whole bridge structure under non-uniform excitation was performed,and probabilistic seismic damage characteristics of bridge piers across fault were deeply discussed.The results showed that effects of structural parametric uncertainty increase with increase in ground motion intensity;for pier adjacent to fault,when slip thrust strength of fault is 78.0 cm,the exceeding probability of complete failure rises from 7.53%of the mean model to 13.01%of the random model,so the vulnerability of the structure may be underestimated if not considering effects of structural parametric uncertainty under strong earthquake;when slip thrust strength of fault is 52.0 cm,exceedance probabilities of pier not adjacent to fault are 97.54%,88.51%,2.42%and 0.06%,respectively under four damage states,while those of pier adjacent to fault are 99.24%,99.15%,6.50%and 0.28%,respectively,so more attention should be paid to aseismic design of bridge piers adjacent to fault and targeted aseismic design should be performed.

关 键 词：简支钢箱梁桥 活动断层 增量动力分析 结构参数不确定性 概率性地震损伤特性 易损性曲线 

分 类 号：U448.217[建筑科学—桥梁与隧道工程]