【摘要】 在地震中发生落梁可导致梁桥连续倒塌破坏.探究地震作用下混凝土梁桥连续倒塌的机理和规律,对于桥梁抗震设计与抗震加固、避免地震中桥梁倒塌破坏有着重要的意义.采用最新的材料本构、合理的结构数值模型及结构碰撞模型,利用有限元软件ABAQUS分析了一座四跨连续梁桥.分析结果很好地模拟了这座梁桥在地震作用下发生连续倒塌的全过程,落梁导致邻近桥墩破坏,其余桥墩及梁跨结构倾斜,引起远端落梁,桥墩接连破坏,最终桥梁全部倒塌.分析结果显示桥墩底部和中部系梁连接处的破坏较严重,应该进行针对性的抗震设计或加固.更多还原

【Abstract】 The progressive collapse of a girder bridge could be induced due to the unseating failure during earthquakes.However,it is important for seismic design and retrofit of bridges to investigate the mechanism of progressive collapse for seismic bridges.With the finite element software ABAQUS,a 4-span continuous girder bridge model is built by using applicable model of material,bearing and collision in this paper.The progressive collapse process of the bridge is revealed distinctly,that is,the adjacent pier is impacted by the unseating girder of the bridge,and it leads to damage of the pier so as to leaning of other piers and unseating of the superstructure at another end.The numerical results show that the bottom and the tie beam of pier are damaged more seriously,and should be considered in design and retrofit.更多还原