行波效应下系梁设置对薄壁刚构桥地震响应影响

Earthquake response of the rigid-frame bridge thin-wall with tie beam under traveling wave effect

采用大型结构分析程序MIDAS/CIVIL建立某薄壁刚构桥模型,基于桥梁上部结构自重等荷载引起的桥墩内力、墩顶位移等为考虑因素,通过在不同视波速条件下,改变横系梁的道数、尺寸、连接方式,对地震作用下连续刚构桥的地震反应的行波效应进行了时程分析的数值模拟.结果表明:横系梁的设置会很明显的改变桥墩的受力情况,视波速越小结构延迟效果越明显,随着波速的增大结构位移、内力是先减小后增大然后趋于平缓.当在桥墩高度的1/2刚接一根尺寸为桥墩的0.55倍横系梁时,会提高结构的整体性能.

The large structural analysis program MIDAS/CIVIL is introduced to establish a thin-walled rigid frame bridge model, and numerical simulation of time history analysis of seismic response of continuous rigid frame bridge under earthquake was performed based on the bridge superstructure weight load caused by the internal force of pier and top displacement for consideration by in different apparent wave velocity condition, change the beam number, size and connection way, The results show that the setting of the transverse beam will obviously change the force of the bridge pier, apparent wave velocity, the smaller the delay effect is more obvious, and the internal force is the first to decrease and then increase slowly with the increase of the wave velocity. The overall performance of the structure can be improved when set 0.55 times the size of the bridge pier on it＇s height of 1/2.