拉索减震支座的抗震性能分析

Numerical Model and Seismic Performance of Cablesliding Friction Aseismic Bearing

摘要:

研制的拉索减震支座的原理为滑板支座的摩擦耗能效应和拉索的限位作用相结合,其力学特性由相关的实验结果模拟得出.以一座实际连续梁结构为背景,建立了不同支座布置形式的模型并进行比较,重点讨论了采用此拉索减震支座后的减震效果,分析了拉索减震支座计算模型中2个参数(拉索松弛的自由程和支座上下板之间摩擦系数)的合理选取问题.结果表明采用此支座能有效减小连续梁中固定墩墩底地震内力,墩、梁相对位移也在可控制范围内.适当增加支座的初始自由程或摩擦系数能提高支座的减震效果.

Abstract:

he developed cablesliding friction aseismic bearing was designed by using the concept of friction energy dissipation and displacement restriction device.Numerical model of this bearing was simulated based on experimental results.Different continuous beam bridge models with different support restraints were established.The effects of seismic mitigation were compared.Some parameters including the initial free movement and the friction coefficient in the bearing model were analyzed.The results show that application of the cablesliding friction aseismic bearing can reduce the earthquake internal force of fixed pier.The initial free movement and the friction coefficient can be properly increased to improve the effect of seismic mitigation.