限位墩墩顶伸缩缝间距对长联梁桥纵向抗震性能的影响  

Effect of the Restrainer Pier Expansion Joint Spacing on the Longitudinal Seismic Performance of Long Bridges

作　　者：王旭[1,2] 黄超 李华强[1] 李世亚 刘怀林 刘海明[2] 

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]招商局重庆交通科研设计院,重庆400067

出　　处：《重庆交通大学学报（自然科学版）》2017年第12期6-12,共7页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：重庆市博士后基金项目(Xm2015066);交通运输部建设科技项目(2013318800020);中央高校基本科研业务费资助项目(310821161120);山东省优秀中青年科学家科研奖励基金项目(2014BSE28027)

摘　　要：工程实践表明,限位墩可以大大降低长联梁桥落梁倒塌事故的发生,而限位墩墩顶伸缩缝尺寸对于长联梁桥纵向抗震性能具有较大的影响。为此,以有限元分析为手段,通过非线性分析方法研究伸缩缝间距对纵向地震作用下长联梁桥动力响应的影响。研究表明:随着间距的增加,主梁未出现碰撞或碰撞力呈现出下降的趋势,普通墩最大墩底弯矩没有呈现出特别明显的规律,而限位墩最大墩底弯矩主要受碰撞力的影响,其最大墩底弯矩的变化和墩顶最大碰撞力类似。普通墩墩梁的最大相对位移,最大碰撞力的大小以及最大墩底弯矩随伸缩缝间距的增大基本变化不大。Practice and experience in engineering shows that restrainer piers can greatly reduce the occurrence of collapse of long bridge,while the size of expansion joints at the restrainer piers top can affect the longitudinal seismic performance of long bridge tremendously. Consequently,the effect of expansion joint spacing on the dynamic response of long bridge under the action of the longitudinal seismic was analyzed by means of finite element analysis. Researches show that with the increase of the spacing,the main beam does not appear collision and the impact force does not show a downward trend. The maximum bending moment of the ordinary pier bottom does not show a particularly obvious law; however,the maximum pier bottom bending moment of the restrainer pier is mainly affected by the impact force,and the change of the maximum pier bottom bending moment is similar to the maximum impact force at the pier top. As a matter of fact,the maximum relative displacement between girder and pier,the maximum impact force as well as the maximum pier bottom bending moment of the ordinary pier do not make difference with the increase of the expansion joint spacing.

关 键 词：桥梁工程 限位墩 伸缩缝 碰撞 最大墩梁相对位移 最大墩底弯矩 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]