考虑地震滑冲效应的高铁简支梁桥横向减震体系研究

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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。

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关键词 ：高速铁路, 简支梁桥, 近断层地震, 滑冲效应, 碰撞效应, 减震体系

Abstract：The transverse pounding responses and damping system of the high-speed railway simply supported beam bridge considering the fling-step effect of near-fault earthquakes are investigated. A 32-m simply-supported girder bridge with 5 spans was taken as the background, and the finite element model of the bridge was established in Abaqus. The difference between the transverse seismic responses of bridge under far-field and near-fault earthquakes were analyzed. The applicability of traditional shear key was studied. The damping performances of three kinds of damping systems were compared and analyzed, including the combination of shear key and cable, cable restrainer, and shock absorber. The results show that compared with the far-field earthquakes, the traditional shear key fails completely due to the fling-step effect of near-fault earthquakes, and the risk of unseating increases significantly. The seismic performance of the "shear key+cable" method is improved as the gap between the shear key and bearing padstones decreases. The damping effectiveness of the cable restrainer increases with the decrease of restraining displacements. The optimal stiffness of the shock absorber can significantly reduce the seismic response of the bridge. By comprehensive comparison, the shock absorber is the most effective damping system.

Key words： High-speed railway Simply supported beam bridge Near-fault earthquake Seismic fling-step effect Pounding effect Damping system

收稿日期: 2021-12-27 出版日期: 2023-04-15

引用本文:

杨孟刚1,2，栗梦成1,2，胡尚韬1,2. 考虑地震滑冲效应的高铁简支梁桥横向减震体系研究[J]. 振动与冲击, 2023, 42(7): 312-320.
YANG Menggang1, LI Mengcheng2, HU Shangtao1. Transverse shock-absorbing system of high-speed railway simply supported beam bridge considering seismic sliding-impact effect. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(7): 312-320.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I7/312

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