基于动力特性分析的刚架拱桥损伤检测及仿真模拟

桥梁结构的模态特性能直接反应桥梁各部分的质量、刚度分布特性。以某市二桥为例,通过桥梁现场模态试验,建立混凝土刚架拱桥空间结构有限元模型,分析桥梁模态特性和结构损伤之间的关系,重点研究横向联系体系对动力特性的影响。结果表明：成桥理想状态模型结构横向刚度较大,直至第7阶振型才出现横向振动,而桥梁运营过程中横向连接的损伤直接导致了该桥在模态试验中横向振型的密集及阶次提前发生。因此,该桥的加固设计需重点考虑横梁连接的补强问题。

Damage diagnosis and simulation analysis of the rigid-frame arch bridge based on dynamic properties

The model characteristic of bridge structures can directly reflect the quality and the characteristic of the stiffness distribution of different parts of the bridges.Taking a city bridge as an example,through the scene modal experiment of the bridge,this paper establishes reinforced concrete rigid-frame arch bridge space structural finite element model and analyzes the relationship between modal characteristic of the bridge and structural damage.And it focuses on horizontal linkages of the impact on the dynamic properties.The results show that ideal modal structural lateral rigidity of the bridge is much larger until the 7-order vibration appears horizontal,but the damage of horizontal connection in the course of operating directly results in intensive horizontal vibration and order in advance in the modal experiment.Therefore,the reinforcement design of the bridge needs to focus on the reinforcement of the beam connections.