为探究梁端之间的碰撞对铁路自复位桥墩地震反应的影响，以一座铁路简支梁桥为工程背景，建立空间自复位桥墩全桥模型，并进行了模型验证。选择七条近断层地震动作为输入，进行非线性时程分析，讨论了梁端碰撞对墩顶位移、提离位移、墩底弯矩、墩底剪力、支座剪力以及碰撞力的影响，探究了伸缩缝宽度和碰撞刚度对碰撞效应的影响规律。结果表明：梁端之间的碰撞会减小墩顶位移，但会显著增大支座剪力与墩底弯矩及墩底剪力。墩顶位移随着伸缩缝宽度增大而增大，墩底弯矩、墩底剪力及支座剪力随伸缩缝宽度增大而减小。支座剪力随碰撞刚度先增大后减小，碰撞刚度对墩顶位移与墩底弯矩的影响相对较小。常用伸缩缝宽度下强震导致的梁端碰撞不可避免，铁路自复位桥梁抗震设计时应考虑碰撞效应的影响。

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.