考虑减隔震设计的弯桥地震响应分析

Seismic Response Analysis of Curved Bridge Considering Seismic Isolation Design

摘要:

为充分了解山区高墩弯桥地震响应特性和抗震性能,以打庆高速打扮1号大桥为工程背景,采用Midas civil软件建立了计算模型并进行时程分析,研究了地震动入射角和摩擦摆支座对墩顶位移和墩底内力的影响。结果表明,随着地震动入射角的变化,墩顶纵向位移和墩底内力均呈现出先增大后减小的变化趋势,且最大纵向位移并未出现在最高墩的墩顶；摩擦摆支座曲面半径和摩擦系数的变化对墩顶最大纵向位移的影响较弱；当曲面半径一定、摩擦系数取为0.01时的墩顶纵向位移和墩底内力均为最大值。

Abstract:

In order to fully understand the seismic response characteristics and seismic performance of high-pier curved bridge in mountainous area, taking the No. 1 Bridge of Daqing Expressway as the engineering background, the calculation model is established by using MIDAS CIVIL software, and the time history analysis is carried out. The effects of seismic incidence angle and friction pendulum support on the displacement of pier top and internal force of pier bottom are studied. The results show that the longitudinal displacement at the top of the pier and the internal force at the bottom of the pier increase first and then decrease with the change of the incident angle of ground motion, and the maximum longitudinal displacement does not appear at the top of the highest pier. The variation of the curved surface radius and the friction coefficient of the friction pendulum bearing have a weak influence on the maximum longitudinal displacement of the pier top. When the radius of the curved surface is fixed and the friction coefficient is 0.01, the longitudinal displacement of the pier top and the internal force of the pier bottom are the maximum.