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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. 針對橋梁結搆在地震作用下梁躰與橫曏擋塊間的碰撞現象，採用非線性時程積分法，研究了橫曏地震作用下梁躰與擋塊間的碰撞傚應。