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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.
It is very important for the seismic design and seismic strengthening of the bridge to avoid the collapse of the bridge during the earthquake.Using the latest Material constitutive model, reasonable structure numerical model and structural collision model, a finite element software ABAQUS is used to analyze a four-span continuous girder bridge.The results of the analysis well simulate the whole process of the continuous collapse of the girder bridge under earthquake, The falling of the bridge led to the destruction of the adjacent bridge piers and the tilting of the remaining bridge piers and beam-span structures, resulting in the successive collapse of the far-end falling beams and bridge piers, and finally the collapse of the bridge.The analysis results show that the connection between the bottom of bridge piers and the middle bridge is more serious and should be targeted Seismic design or reinforcement.