某高速公路桥梁拓宽后伸缩缝锚固区混凝土破坏原因分析

结合九乡河大桥扩建工程，探讨了桥台处伸缩缝锚固区混凝土的有限元建模方法，着重研究了桥台处伸缩缝锚固区混凝土的破坏成因。分析表明，伸缩缝锚固区开裂的主要原因是新旧桥台的不均匀沉降，采用文中提供的建模方法，可以正确地模拟伸缩缝处混凝土的破坏，从而明确破坏机理，并为此类旧桥加宽工程的设计和施工提供借鉴。

Mechanical Analysis of Concrete Destroying in the Anchorage Zone of a Highway Bridge

This paper analyses the reasons of concrete destroying on shrinking cracks according to the widening project of Jiuxiang river bridge.It discusses the finite element method modeling the concrete in the anchorage zone of shrinking cracks.The results show that the concrete cracks are induced by differential settlement between new and old abutment. and the modeling method provided in this paper can correctly simulate the concrete expansion joint damage,thereby revealing the failure mechanism.The research results can be taken as reference to the same project.