东南大学学报（自然科学版）2017，Vol.47Issue(5)：1006-1012,7.DOI:10.3969/j.issn.1001-0505.2017.05.026
考虑PGA和PGV比值影响的板式橡胶支座连续梁桥减震控制
Aseismic control of continuous bridge with laminated rubber bearings considering ratio of PGA to PGV
摘要
Abstract
To solve the problem that bridge collision or girder falling might be caused by the bearing sliding of bridges with laminated rubber bearings under strong earthquake,a finite model of a continuous bridge isolated by laminated rubber bearings was established by ANSYS.Based on the time-his tory analysis,the influence of the ratio of the peak ground acceleration (PGA) to the peak ground velocity(PGV),fg,on the sliding response of the laminated rubber bearings was discussed and the relatively unfavorable ground motion input mode was concluded.With the input of the relatively unfavorable ground motion,the cable sliding friction aseismic bearings were introduced to absorb shock,and the parameter sensitivity analysis of the cable stiffness and the initial gap was carrided out.The results show that fg can characterize the frequency characteristics of the ground motion to some extent.The sliding capacity of the plate rubber bearing and the bearing displacement increase as fg decreases.Under the relatively unfavorable ground motion with small fg,the cable sliding friction aseismic beatings have great capacity of displacement restriction,and reasonable setting of the cable stiffness and the initial gap can effectively prevent disasters such as bridge collision and beam falling.关键词
板式橡胶支座/滑动效应/地震动特性/拉索减震支座Key words
laminated rubber bearings/sliding effect/ground motion characteristics/cable sliding friction aseismic bearings分类
交通工程引用本文复制引用
向需文,王浩,李爱群,吴宜峰,沙奔..考虑PGA和PGV比值影响的板式橡胶支座连续梁桥减震控制[J].东南大学学报（自然科学版）,2017,47(5):1006-1012,7.基金项目
国家自然科学基金资助项目(51278104,51578151). （51278104,51578151）
