【摘要】 对近断层地震滑冲效应作用下高铁简支梁桥横向碰撞响应及其减震体系进行了研究。以一座5跨32 m简支梁桥为背景，采用Abaqus软件建立全桥有限元模型。分析了远场地震和近断层地震滑冲效应作用下桥梁横向地震响应的差异，探究了传统抗震挡块的适用性；对比分析了“挡块+拉索”组合、全桥单独安装拉索限位器及单独安装减震榫等3种减震体系的减震效果。结果表明：与远场地震相比，近断层地震滑冲效应作用下传统抗震挡块完全失效，落梁风险显著增加；挡块与垫石间隙越小，“挡块+拉索”的减震效果越好；拉索限位器的减震效果随拉索自由程减小而提高；减震榫取最优刚度时，能够显著减小桥梁地震响应；综合比选，全桥单独安装减震榫的减震体系最佳。更多还原

【Abstract】 Here, transverse impact response and shock-absorbing system of high-speed railway simply supported beam bridge under near-fault seismic sliding-impact effect were studied. Taking a 5-span 32 m simply supported beam bridge as the background, the whole bridge finite element(FE) model was established using the FE software Abaqus. Differences of lateral seismic responses of bridge under actions of far-field and near-fault seismic sliding-impact effects were analyzed, and the applicability of traditional anti-seismic block was explored. Shock-absorbing effects of 3 shock-absorbing systems including combination of “block+cable”, cable stopper installed alone overall bridge and damping tenon installed alone overall bridge were analyzed contrastively. The results showed that compared with far-field earthquake, traditional anti-seismic block fails fully and the risk of beam-falling significantly increases under the action of near-fault seismic sliding-impact effect; the smaller the gap between block and pad stone, the better the damping effect of “block+cable”; damping effect of cable stopper increases with decrease in free path of cable; when damping tenon has the optimal stiffness, bridge seismic response can be significantly reduced; through comprehensive comparison, shock-absorbing system with damping tenon installed alone overall bridge is the best.更多还原