考虑支座摩擦滑移的高墩弯桥地震响应分析

摘要:

为研究高墩弯桥在考虑支座摩擦滑移后地震响应的特点和规律,采用Midas civil软件建立了2联连续弯桥有限元模型。基于板式橡胶支座的双折线恢复力模型,研究了结果的地震响应和支座剪切刚度的影响规律。研究结果表明：考虑支座的摩擦滑移效应后,墩顶最大位移减小了5.5%,墩底最大弯矩减小了4.7%,墩底最大剪力增大了27.1%；随着支座剪切刚度的增加,墩底弯矩和墩顶纵向最大位移先增大后减小,墩底剪力和梁体纵向最大位移逐渐减小。

Abstract:

In order to study the characteristics and laws of seismic response of high pier curved bridge considering bearing friction and slip, the finite element model of two connected continuous curved bridge is established by using Midas civil software. Based on the double broken line restoring force model of plate rubber bearing, the influence law of seismic response and bearing shear stiffness is studied. The results show that the maximum displacement at the top of the pier decreases by 5.5%, the maximum bending moment at the bottom of the pier decreases by 4.7%, and the maximum shear force at the bottom of the pier increases by 27.1%; With the increase of the shear stiffness of the support, the bending moment at the pier bottom and the maximum longitudinal displacement at the pier top first increase and then decrease, and the shear force at the pier bottom and the maximum longitudinal displacement of the beam body gradually decrease.