Transverse shock-absorbing system of high-speed railway simply supported beam bridge considering seismic sliding-impact effect

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (7) : 312-320.

YANG Menggang1,2, LI Mengcheng1,2, HU Shangtao1,2

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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

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YANG Menggang1, LI Mengcheng2, HU Shangtao1. Transverse shock-absorbing system of high-speed railway simply supported beam bridge considering seismic sliding-impact effect[J]. Journal of Vibration and Shock, 2023, 42(7): 312-320

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