【摘要】 结合实际震后现象对高原大桥的落梁破坏进行模拟分析,对震后落梁现象提出了一个新的解释,即认为地震过程中高原侧桥台后土体先发生破坏,在失去土体的支撑作用下桥台背墙在与邻梁的碰撞中被撞碎并被顶入土体中,从而引起墩台处的墩(台)梁位移增大,并最终导致落梁破坏的发生。更多还原

【Abstract】 Unseating of Gaoyuan Bridge girders is studied based on the unseating phenomenon during the Wenchuan Earthquake.As to the unseating of the bridge girders after an earthquake,the paper presents a new perspective that the soil behind Gaoyuan abutment is seriously damaged during earthquake;without the support of soil,the abutment breast wall is sundered during the pounding and then is pushed into the soil.This causes a larger relative displacement of the bridge girders to the piers,leading to the unseating damage of girders in the end.更多还原