超高墩大跨部分曲线连续刚构桥地震反应分析  

Seismic Response Analysis of Partial Curve Long-span Continuous Rigid Frame Bridge with Super High Piers

作　　者：王达[1] 刘扬[1] 陈敏海[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410064

出　　处：《公路交通科技》2011年第1期74-79,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金资助项目(50608009);交通运输部西部交通科技项目(200631800019);桥梁与隧道工程重点学科基金资助项目(10QSXK08)

摘　　要：基于时程分析法,借助大型有限元计算程序,以四川某超高墩大跨部分曲线连续刚构桥为背景,对该桥进行了自振特性及地震反应分析,对比研究了同条件下部分曲线桥与直线桥的抗震性能的差异,对左右幅之间的横向联系对结构整体刚度的贡献及对结构整体抗震性能的影响也进行了相应研究。研究结论表明:该类结构的曲线线形对自振频率的影响较少,其结构刚度主要受制于桥墩,若在左右幅之间增设横向联系,将在很大程度上改善结构的受力;该类结构的抗震性能受主梁与桥墩二者刚度比值的影响较明显,当二者刚度比值处于合理范围时能有效的降低结构位移动力响应,有利于结构的抗震;此外,桥墩的高度对结构的动力稳定性的影响较大,随着桥墩高度降低,结构动力稳定性越趋于稳定。Based on the time history analysis method and large finite element program,the natural vibration characteristics and the seismic response of a partial curve long-span continuous rigid frame bridge with super high piers in Sichuan were analysed.Comparative study of antiseismic performance between partial curve bridge and straight bridge was performed.The contribution of the lateral rigidity reinforcement of the structure and its influence on antiseismic performance of the structure were researched respectively.The conclusion of the study shows that（1） The geometric configuration of this kind of structure has little influence on the natural frequency,and its structural rigidity is mainly effected by the bridge piers.If additionally build the lateral rigidity reinforcement,the mechanics characteristic of the structure will be improved greatly.（2） The antiseismic performance of this kind of structure is obviously influenced by the rigidity ratio between the girder and the pier.When the rigidity ratio is in the reasonable scope,the structural dynamic response can be effectively reduced to improve the structure seismic behavior.（2） The height of the piers has great influence on the dynamic stability,the lower the height is,the better the dynamic stability is.

关 键 词：桥梁工程 地震反应 时程分析法 位移时程 弯矩时程 抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]