部分填充混凝土钢桁梁桥车激响应分析

Dynamic Analysis of Partially Concrete-filled Steel Truss Girder Bridge Under Vehicle Load

以天津海河部分填充混凝土钢桁梁桥为研究对象,采用ANSYS有限元软件,建立了桥梁和汽车有限元模型,利用生死单元技术实现了车桥耦合振动的数值仿真,采用Newmark-β法求解其动力响应。在此基础上,分析探讨不同桥面等级和车速等因素对部分填充混凝土钢桁梁桥动力响应的影响。结果表明:部分填充混凝土能有效增大钢桁梁桥的竖向刚度,提高桥梁承载力;桥面等级对部分填充混凝土钢桁梁桥车激响应影响较大,等级越低,动力响应增幅越大;提高车速并不能大幅降低部分填充混凝土钢桁梁桥的动力响应。

In order to study the dynamic response of partially concrete-filled steel truss girder bridge under vehicle load,partially concrete-filled steel truss girder bridge in Tianjin Haihe was taken as a case,the finite element model of bridge and vehicle was established by using live and death technology in ANSYS and numerical emulation of vehicle-bridge coupling vibration was made.On the basis,the influences of different deck grade and vehicle speed on dynamic response of partially filled concrete steel truss bridge were analyzed and discussed.The results show that partially filled concrete can effectively increase the vertical stiffness of steel truss bridge and improve the bearing capacity of the bridge,and the grade of bridge deck has great influence on the vehicle-induced response of partially filled concrete steel truss bridge,the lower the grade,the greater the increase of dynamic response.Increasing vehicle speed does not significantly reduce the dynamic response of partially filled concrete steel truss bridge.