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.