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阐述减震榫-活动支座的工作原理及构造形式,以某5跨高速铁路简支梁桥为例,研究减震榫-活动支座的减震性能,并系统分析支座动力参数及桥梁结构自振周期对减震榫-活动支座简支梁桥地震响应的影响.结果表明:减震榫-活动支座能有效降低桥墩的地震需求,但会在一定程度上增加梁体位移;支座屈服强度对桥梁地震响应影响较大,应综合考虑其对桥墩内力和梁体位移的影响规律进行优化选择;支座初始刚度主要影响上部结构位移而屈服后刚度主要影响桥墩内力,为保证减震榫耗能能力发挥,建议硬化比控制在0.15以下;减震榫-活动支座减震效果随桥墩刚度减小呈先上升再降低的变化规律,更适用于高度小于16 m的桥墩.“,”This paper introduces the working principle and structural form of shock absorber-movable support,and studies the performances of the support with reference to a five-span high-speed railway simply-supported beam bridge and analyzes the impacts of the parameters of the support and the natural period of vibration of the bridge structure on seismic response of the simply supported beam bridge equipped with shock absorber-movable support.The results indicate that the seismic demand of pier can be significantly reduced by setting the shock absorber-movable support,but the displacement of the main girder is increased to some extent.The influence of yield strength on bridge seismic response is obvious and should be optimized with both girder displacement and pier internal force taken into account.The initial stiffness of the support system mainly affects the displacement of the superstructure,and the yield stiffness primarily influences the seismic response of pier.The stiffness ratio should be controlled below 0.15 to bring the energy dissipation capacity into full play.With the pier stiffness decreasing,the damping effect of the support system tends to rise first and then fall.The shock absorber-movable support is more suitable for piers less than 16 m in height.