桥墩选型对连续刚构桥地震响应的影响

On influence of type selection for bridge piers on seismic response of continuous rigid frame

为研究桥墩截面形式对连续刚构桥的动力及地震响应,以陕西某连续刚构桥为例,分别采用与原桥相同的纵向刚度和横向刚度双肢墩,使用大型空间有限元分析软件迈达斯Midas Civil 2018建立了矩形空心墩和双肢薄壁空心墩不同截面尺寸的有限元模型,运用时程分析法,对比分析了单肢墩与双肢墩结构对地震的响应,结果表明:双肢墩可以有效减少连续刚构桥的桥墩弯矩效应,但是会适当增加其位移响应。研究成果可为该类桥梁的弹性设计提供一定的参考和依据。

In order to study the dynamic and seismic response of the sections of pier’s to the continuous rigid frame bridge,a continuous rigid frame bridge in Shaanxi Province is taken as an example.The double pier with the same longitudinal stiffness and transverse stiffness as the original bridge is used,and the large-scale spatial finite element analysis software Midas Civil is used in 2018,the finite element models of different cross-section sizes of rectangular hollow pier and double limb thin-walled hollow pier were established.By using the time history analysis method,the response of single limb pier and double limb pier structure to the earthquake was compared and analyzed.The results show that double limb pier can effectively reduce the pier bending moment response of continuous rigid frame bridge,but it will appropriately increase its displacement response.The research results of this paper can provide some reference and basis for the elastic design of this kind of bridge.