高铁运营诱发振动对平转桥梁球铰应力影响

STRESS RESPONSE ANALYSIS OF SPHERICAL HINGE OF HORIZONTAL ROTARY BRIDGE UNDER THE MOTIVATION OF HIGH-SPEED RAILWAY OPERATION

为研究高铁运营振动所诱发平转桥球铰应力的变化,文中以跨越京广高铁的平面转体桥——英红特大桥为背景。基于有限元法,采用ABAQUS建立了精细模拟球铰接触关系的平面转体桥梁有限元模型,通过现场实测加速度时程,并将加速度时程作为外部激励施加于平转桥有限元模型,得到球铰应力在高铁运营诱发振动作用下的响应结果。认为高铁运营振动所诱发的英红特大桥球铰应力的影响应予以考虑,且当桥位距离高铁线路较近的时候,高铁运营所诱发振动对球铰的影响也会随着距离缩短而增加,故在今后进行平转法桥梁的设计时,应当对高铁振动对球铰的影响予以考虑。

In order to study the change of swing bridge spherical hinge stress induced by high-speed railway operation vibration,this paper takes Yinghong bridge as the background.Based on the finite element method,ABAQUS is used to establish the finite element model of a horizontal rotary bridge which can simulate the contact relationship between spherical joints precisely.Through field measurement of acceleration time history and applying acceleration time history as external excitation to the finite element model of the swing bridge,the response of spherical hinge stress to vibration induced by high-speed railway operation is obtained.It is considered that the influence of high-speed railway operation vibration on the spherical hinge stress of Yinghong bridge should be considered.When the bridge is close to the high-speed rail line,the influence of vibration induced by high-speed railway operation on spherical joints will also increase with the decrease of distance.Therefore,the influence of high-speed railway vibration on spherical joints should be considered during the design of horizontal rotary bridge in the future.