设置自复位耗能支撑的斜拉桥横向抗震性能研究  

SEISMIC PERFORMANCE STUDY ALONG THE TRANSVERSE DIRECTION OF CABLE-STAYED BRIDGES WITH SELF-CENTERING ENERGY DISSIPATION BRACES

作　　者：徐龙河[1] 武虎 XU Long-he;WU Hu(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《工程力学》2019年第4期177-187,共11页Engineering Mechanics

基　　金：国家自然科学基金项目(51578058);北京市自然科学基金项目(8172038)

摘　　要：为减小斜拉桥横桥向的地震响应,提出一种设置预压弹簧自复位耗能支撑的斜拉桥横向减震体系及支撑参数的设计方法。以一座斜拉桥为研究对象,对支撑参数进行了设计,并对塔梁固结体系和采用支撑的减震体系进行地震时程分析,从关键位置的地震响应、耗能能力等方面对支撑体系的抗震性能进行了研究。结果表明,横桥向采用预压弹簧自复位耗能支撑的斜拉桥减震体系利用支撑良好的滞回耗能特性,有效减小桥塔位移和应变,改善桥塔受力,减小主梁的残余位移。附加预压弹簧自复位耗能支撑对斜拉桥地震响应有良好减震控制效果,是一种合理的抗震体系。To mitigate the seismic-induced responses of cable-stayed bridges in the transverse direction, a transverse seismic mitigation system of cable-stayed bridges with pre-pressed spring self-centering energy dissipation braces was proposed in this study. A parameter design method for the braces was developed. Taking a cable-stayed bridge as the study example, the brace parameters were designed and the time history analysis of the tower-beam fixed system and the seismic mitigation system with braces were carried out. The seismic performance of the braced systems was analyzed in terms of the seismic responses at key locations, the energy dissipation capabilities, etc. The results show that the seismic mitigation system of the cable-stayed bridge with pre-pressed spring self-centering energy dissipation braces in the transverse direction utilizes the good hysteretic energy dissipation characteristics of the braces to reduce the displacement and strain of the bridge tower, improve the force distribution of the bridge tower and reduce the residual displacement of the beam. Cable-stayed bridges with pre-pressed spring self-centering energy dissipation braces has good mitigation and control effects on the seismic responses, which is a prominent and promising seismic resistance system.

关 键 词：斜拉桥 预压弹簧自复位耗能支撑 减震设计 横向 抗震性能 

分 类 号：TU352.1[建筑科学—结构工程] U448.27[建筑科学—桥梁与隧道工程]