基于摩擦摆支座的矮墩连续梁桥隔震性能研究

Study on Seismic Isolation Performance of Short Pier Continuous Girder Bridge Based on Friction Pendulum Bearing

以一座地震高烈度区矮墩连续梁桥为分析对象,结合桥址所在区域的场地条件和地震动参数,采用摩擦摆支座进行减隔震设计。通过Midas Civi软件建立有限元分析模型,采用非线性时程分析法,分析了不同支座约束边界条件下的动力特性和地震响应。结果表明:摩擦摆支座可以延长结构周期,使结构的内力、位移分布更为均匀,具有良好的减隔震性能。

Targeting at a short pier continuous girder bridge in the high earthquake intensity area,combined with the site condition and the ground motion parameter,the friction pendulum bearing was used to conduct the design of the seismic isolation and absorption.The finite element analysis model was established by the Midas Civil software,and by the nonlinear time history analysis,the dynamic characteristics and seismic response under different constraint boundary conditions were analyzed.The results showed that the friction pendulum bearing could extend the structure period and even the distribution of internal force and displacement with excellent seismic isolation and absorption performance.