脉冲型地震动对山区高墩桥弹塑性动力响应的影响分析  

Effect of pule-like ground motion on elastic-plastic dynamic response of high pier bridges in mountainous areas

作　　者：李倩[1] 杨宁欣 李晰[1] 李岩[2] LI Qian;YANGNingxin;LI Xi;LI Yan(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090

出　　处：《铁道科学与工程学报》2019年第7期1719-1727,共9页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51508473)

摘　　要：为研究脉冲型地震动对山区高墩桥弹塑性动力响应的影响,以一座典型的高墩桥作为研究对象,通过纤维截面充分考虑桥墩的弹塑性,并采用谱兼容的方法选取具有不同脉冲周期的天然地震记录,在此基础上对比分析脉冲效应对桥梁结构动力响应的影响。研究结果表明:脉冲型地震动对高墩桥的弹塑性动力响应产生较为明显的影响,并且脉冲周期与结构自振周期越接近,对结构响应的放大作用就越明显;在A类场地条件下脉冲效应对高墩桥的动力响应影响最大,在场地条件较好时也应充分考虑脉冲效应对结构的影响;建议在对山区高墩桥进行抗震设计时,不仅要考虑地震动的脉冲效应,还应充分考虑场地条件以及脉冲周期等因素的影响。To study the effect of pule-like ground motion on seismic response of high pier bridge in mountainous area, this paper presented a theoretical analysis for a typical high pier bridge. The fiber section was first adopted to fully consider the elastoplastic behavior of the pier. The actual ground motion records with different pulse periods were selected by using the spectrum match method, and then a comparative analysis was carried out considering the pulse effect. The results showed that pulse-like ground motion can significantly affect the elastic-plastic responses of high pier bridge, and the closer the pulse period was to the natural vibration period of the structure, the more obvious the amplification effect on the structural response. The pulse effect should be considered even if the site condition was good due to the effect of pulse on high pier bridge was most obvious in site A. Therefore, it was suggested that not only the pulse effect but also the influence of site condition and the pulse period on the pulse effect should be considered for the seismic design of high pier bridge in mountainous area. Otherwise, the structural response of high pier bridge will be incorrectly estimated.

关 键 词：脉冲型地震动 高墩桥 脉冲周期 场地条件 动力响应 

分 类 号：TU317.1[建筑科学—结构工程] TU352.1