摘要
为了研究横向弹塑性挡块对梁式桥横向抗震性能的影响,以一典型梁式桥为工程背景,应用非线性时程方法分析比较了墩梁之间横向固结、横向无水平约束、采用弹塑性钢挡块三种约束方式下结构的地震响应。研究表明:假设墩梁之间横向固结会导致较大的墩柱横向地震内力响应,而假设墩梁横向无水平约束导致较大的墩梁横向相对位移,增加落梁风险。采用弹塑性钢挡块(横桥向弹塑性约束)可以合理控制横桥向墩梁相对位移和墩柱的横向地震反应。
In order to investigate the influence of elastic-plastic stop block on the seismic performance of girder bridge, the method of nonlinear time history is adopted to analyse the different seismic performance of bridges whose piers and beams are laterally restricted in three different ways： freely, with rigid stop block, with elastic-plastic stop block. The research shows that the beam fixed with rigid stop block in the transverse orienta- tion would lead to comparatively strong response in the piers. While the beam with no constrains in the transverse orientation would result in large relative movement between piers and beams and increase the risk of unseating of spans. With the adoption of elastic-plastic stop block, the relative movement between piers and beams and seis- mic response of piers would be under reasonable control.
出处
《石家庄铁道大学学报（自然科学版）》
2014年第1期14-18,共5页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
基金
国家自然科学基金项目(51278371)
国家重点基础研究发展计划(2013CB036302)
关键词
梁式桥
弹塑性钢挡块
抗震性能
刚度
girder bridge
elastic-plastic steel stop block
seismic performance
stiffness
