横向抗震挡块对桥梁抗震性能的影响分析

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。

Influence Analysis of Lateral Stop Block on Bridge Seismic Performance

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 orientation 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 seismic response of piers would be under reasonable control.