【摘要】 城市桥梁是城市交通网络的枢纽工程,建设成本高,一旦遭遇地震破坏,不仅会导致严重的交通瘫痪和巨大的经济损失,而且其震后修复极其困难且费用大,因此,城市桥梁的抗震防灾问题日益受到学术界和工程界的高度重视。近几十年的几次大地震表明,地震时桥梁大多因发生碰撞而引发破坏、落梁甚至坍塌等严重灾害。桥梁结构本身有其缺点,在通常情况下可能表现不出来,但是在强震下,特别是桥梁的上部结构由于邻梁或邻联间相互撞击而导致落梁和墩底的破坏甚至倒塌。因此有必要对桥梁结构进行碰撞效应分析。更多还原

【Abstract】 Bridges,which have high construction costs,are pivotal projects for the city’s transportation network.And when earthquakes happen,bridge damages might paralyze the traffic and cause great economic loss.As a result,earthquake-resistant and damage prevention of city bridges have been highly paid attention in academic and engineering fields.According to the violent earthquakes in recent decades,bridge damages,including girder falling and collapse,are mainly caused by collisions.In earthquake,the defects of bridge structure are presented through girders’ collision,which may cause girder falling or even bridge collapse.So it is necessary to analyze the collision effect of bridge structure.更多还原