Effects of inter-beam end collisions effect on seismic response of railway self-resetting bridge piers

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (7) : 172-180.

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Effects of inter-beam end collisions effect on seismic response of railway self-resetting bridge piers

YANG Ze, XIA Xiushen*, ZHU Haoran, YANG Zhongren, ZHANG Zhizhong

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Abstract

To investigate the effect of pounding between beam ends on the seismic response of railway self-centering bridge piers, a spatial self-centering bridge pier full-bridge model was established with a railway simply supported beam bridge as the engineering background, and the model was validated. Seven near-fault ground motions were selected as inputs for a nonlinear time-history analysis. The study discussed the impact of beam-end pounding on pier-top displacement, pier-bottom moment, pier-bottom shear force, bearing shear force, and pounding force. It also explored the influence of expansion joint width and pounding stiffness on pounding effect. The results indicate that: poundings between beam ends reduce pier top displacement but significantly increase bearing shear force, pier bottom bending moment, and pier bottom shear force. Pier top displacement increases with the expansion joint width, while pier bottom bending moment, pier bottom shear force, and bearing shear force decrease with the expansion joint width. The bearing shear force first increases and then decreases with the pounding stiffness, while the pounding stiffness has a relatively small effect on pier-top displacement and pier-bottom moment. Pounding between beam ends caused by strong earthquakes under commonly used expansion joint widths are inevitable, and the influence of pounding effects should be considered in the seismic design of railway self-centering bridges.

Key words

Railway / self -centering bridge piers / pounding effect / seismic response / bearing shear force

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YANG Ze, XIA Xiushen, ZHU Haoran, YANG Zhongren, ZHANG Zhizhong. Effects of inter-beam end collisions effect on seismic response of railway self-resetting bridge piers[J]. Journal of Vibration and Shock, 2025, 44(7): 172-180

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