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In order to reduce the pounding effect of bridges between a girder and a side retainer under earthquake, a new slipping side retainer is designed. 针对桥梁结构在地震作用下梁体与横向挡块间的碰撞现象，采用非线性时程积分法，研究了横向地震作用下梁体与挡块间的碰撞效应。