基于ETM的中小连续梁桥纵桥向地震碰撞响应分析  

ETM based longitudinal seismic pounding response analysis on continuous beam bridges with medium-and-short span

作　　者：李子奇[1,2] 王宇瀚 王力[1] LI Ziqi;WANG Yuhan;WANG Li(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China;Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070

出　　处：《公路交通科技》2025年第2期137-145,共9页Journal of Highway and Transportation Research and Development

基　　金：甘肃省自然科学基金项目(20JR10RA237)。

摘　　要：【目标】解决地震作用下主引桥间纵桥向碰撞分析过程计算量大、计算效率低、数据提取及处理繁琐的问题。【方法】以1座公路连续梁桥为工程实例建立有限元计算模型,并基于中国抗震规范所推荐的加速度反应谱生成3条耐震时程曲线,采用耐震时程法与增量动力分析法进行计算分析;将2种计算方法所需有限元分析时间、所得结构内力响应及位移响应等结果进行比对分析,以验证耐震时程法的有效性和可靠性,在此基础上使用耐震时程法进行纵桥向碰撞响应分析。【结果】耐震时程法可以很好地与中国抗震规范相结合,可以较为精确地预测结构响应变化情况及结构的非线性影响,相较增量动力分析法,采用耐震时程法在保证计算精度的基础上计算效率得到提升,较好地解决了增量动力分析法计算效率不高的问题;结构位移响应相较内力响应对碰撞具有更高的敏感性,边墩在碰撞作用下响应变化情况更为复杂。【结论】实际工程中应重视碰撞对边墩墩顶位移响应的影响。研究成果也可为中小跨径桥梁抗震性能快速评估的工作开展提供理论依据。[Objective]To solve the problems of high computational load,low efficiency and cumbersome data processing during longitudinal pounding analysis between main and approach bridges under earthquake,a highway continuous beam bridge was taken for an engineering example to establish the finite element model.[Method]Three seismic time-history curves were generated based on the acceleration response spectrum according to China’s seismic specifications.The endurance time method and incremental dynamic analysis were used for calculation and analysis.The required finite element analysis time,the resulting structural internal force response, and the displacement response of two computational methods were compare andanalyze. The effectiveness and reliability of endurance time method were verified. On this basis, thelongitudinal pounding response analysis was carried out by using the endurance time method. [ Result] Theendurance time method has good compatibility with China’s seismic specifications. It can accurately predictthe structural response variation and the structural nonlinear effects. Compared with the incremental dynamicanalysis method, the endurance time method has higher calculation efficiency on the basis of ensuringcalculation accuracy. It solves the problem of low computational efficiency with incremental dynamic analysismethod. Compared with internal force response, the structural displacement response is more sensitive topounding. The response variation on side pier under pounding is more complex. [Conclusion] The influenceof pounding on side pier top displacement response should be emphasized in practice. The study result canalso provide the theoretical basis for the rapid seismic performance evaluation for bridges with medium-and-shortspan.

关 键 词：桥梁工程 碰撞响应分析 耐震时程法 连续梁桥 地震反应 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]