基于结构非一致激励地震动方程,建立空间非线性有限元模型,探讨一致输入、行波输入下结构的地震响应,分别以主梁纵向位移、塔底内力为控制目标,研究粘滞阻尼器参数变化对结构减震效果的影响.计算结果表明:地震作用下塔底顺桥向弯矩达365.12 MN·m,对自锚式斜拉-悬索协作体系桥的设计起控制作用；行波效应使得主梁跨中横向位移增大42％,横向弯矩减小14％；结构纵向位移及塔底内力在考虑行波效应后减小9％左右,安装参数合理的阻尼器使主梁纵向位移减小44％,主梁跨中弯矩和剪力减小41％,塔底纵向弯矩减小37％.达到减震效果.%The seismic response after installing viscous dampers was analyzed. Based on the equation of multi-support excitation, a spatial nonlinear finite element model was established and the seismic response of the bridge under synchronous excitation and traveling seismic excitation were discussed. In order to reduce the longitudinal displacement of the girder and the inner force of the pylon bottom, parameters of the viscous damper was studied. The results show that transverse displacements in mid-span increase by 42% and the transverse moment reduces by 14% under traveling seismic excitation. The longitudinal displacement and inner force of the pylon bottom reduces about 9% considering the effect of the traveling seismic excitation. The longitudinal displacement of the girder reduces by 44%, longitudinal moment and shear of the girder in mid-span reduces by 41% and longitudinal moment of the pylon bottom reduces by 37% through installing viscous damper with appropriate parameters. The seismic response can be controlled effectively.
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