基于SIMPACK平台的随机车流与风联合作用下桥梁动力响应分析  

Dynamic Response Analysis of Bridge under Combined Action of Random Traffic Flow and Wind Based on SIMPACK Platform

作　　者：熊涛 韩艳 马行川 李前名 严乃杰 张非 胡朋 XIONG Tao;HAN Yan;MA Xingchuan;LI Qianming;YAN Naijie;ZHANG Fei;HU Peng(Wuhan Company,China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan,Hubei 430074,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中铁大桥勘测设计院集团有限公司武汉分公司,湖北武汉430074 [2]长沙理工大学土木工程学院,湖南长沙410114 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京市100081

出　　处：《中外公路》2024年第6期159-167,共9页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:52178451,52008396,52178452);湖南省自然科学基金资助项目(编号:2024JJ2002)。

摘　　要：为解决传统随机车流与风联合作用下桥梁动力响应计算的耗时问题,该文先以某钢箱连续梁桥为工程背景,在商业软件Ansys和SIMPACK中分别建立桥梁有限元模型和车辆模型,依次计算单个车辆荷载作用下、风荷载作用下以及多个车辆荷载作用下的桥梁动力响应,以验证桥梁动力响应的可叠加性。在此基础上,采用蒙特卡罗法生成随机车流样本,通过已验证的桥梁动力响应可叠加性,计算得到不同随机车流状况、不同车速以及不同风速时随机车流与风联合作用下的桥梁动力响应。研究结果表明:桥梁动力响应叠加方法能有效提高计算效率;风荷载主要影响桥梁的横向响应,而车辆荷载主要影响桥梁的竖向响应;随着车流由稀疏变成密集,桥梁主跨的竖向位移与速度的标准差及其增幅均大于边跨的,而边跨的竖向加速度标准差及其增幅却大于主跨的;随着车速提高,桥梁的竖向位移标准差和竖向速度标准差均逐渐变大,而边跨的竖向加速度标准差先增加后减小;随着风速的提高,桥梁的横向响应标准差总体上逐渐变大,且主跨的增幅要大于边跨的。To deal with the time-consuming problem of calculating the dynamic responses of the bridge under the combined action of random traffic flow and wind,a steel box continuous girder bridge was taken as the engineering background,and the finite element model of the bridge and the vehicle model were established in the commercial software Ansys and SIMPACK,respectively.Then,the dynamic responses of the bridge subjected to the single vehicle load,wind loads,and multiple vehicle loads were calculated to verify the superposability of the dynamic responses of the bridge.On this basis,the Monte Carlo method was used to generate the random traffic flow samples.By using the verified superposability of the dynamic responses of the bridge,the dynamic responses of the bridge under the combined action of random traffic flow and wind were calculated under different random traffic flow conditions,different vehicle speeds,and different wind speeds.The research results show that the superposition method of the dynamic responses of the bridge proposed in this paper can effectively improve the calculation efficiency.The wind load mainly affects the lateral response of the bridge, while the vehicle load mainly affects the vertical response of the bridge. As the traffic flow changesfrom sparse to dense, the standard deviation values of the vertical displacement and vertical velocity of themain span of the bridge and their increases are larger than those of the side span, while the standard deviationvalues of the vertical acceleration of the side span and their increases are larger than those of the main span. Asthe vehicle speed increases, the standard deviation values of the vertical displacement and the vertical velocityof the bridge gradually increase, while those of the vertical acceleration of the side span first increase and thendecrease. As the wind speed increases, the standard deviation values of the lateral response of the bridgegradually increase, and the increase of the main span is greater than that of the side span.

关 键 词：随机车流 风荷载 连续梁桥 动力响应 SIMPACK 

分 类 号：U442[建筑科学—桥梁与隧道工程]