车致脉动力作用下桥上防风屏障的振动响应分析  

Analysis of vibration response of bridge's wind barrier to fluctuating force induced by train running

作　　者：张田[1] 郭薇薇[2] 杜宪亭[2] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《铁道建筑》2015年第3期5-8,11,共5页Railway Engineering

基　　金：国家重点基础研究发展计划项目(973项目)(2013CB036203);中央高校基本科研业务费专项资金资助项目(3132014071);国家自然科学基金项目(51308034)

摘　　要：高速铁路桥上的防风屏障会受到列车运行产生的脉动气冲力作用,防风屏障在脉动气冲力作用下的振动是防风屏障设计必须考虑的问题。本文建立了防风屏障有限元模型,考虑自然风荷载、结构自重和列车引起的脉动风荷载,以兰新铁路第二双线桥上防风屏障为实例,分析防风屏障各关键节点处的振动响应。结果表明:考虑自然风及车致气动力的脉动特性会显著增加防风屏障的动力响应;分析车致气动力对防风屏障的结构响应时应将自然风基本风压作为静载同时计算;另外应特别关注挡风板的振动,其响应远高于立柱。The wind barrier on the high-speed railway bridge is subject to the fluctuating force induced by the running train. The vibration response of the barrier under the fluctuating force shall be taken into account in the wind barrier design. A finite element model of wind barrier was established to calculate the vibration response considering the load combination of the natural wind load,the self-weight of the structure and the fluctuating load. The wind barrier on the bridge in new built Lanzhou-Xinjiang railway line was taken as an example. The vibration responses of the key nodes in the model were calculated. The results revealed that the dynamic response of the wind barrier greatly increased when considering the fluctuating characteristic of the natural wind and aerodynamic force induced by the train. The vibration response calculation of the wind barrier shall be calculated considering the combination of the aerodynamic force induced by the train and the basic wind pressure of the natural wind as the static load. Additionally,the vibration of the windbreak plate of the barrier shall be carefully designed,whose response was much higher than that of stand column.

关 键 词：桥梁 高速铁路 自然风场 车致脉动力 防风屏障 振动响应 

分 类 号：TU311.3[建筑科学—结构工程]