Study of Typical Deteriorations of Concrete Rigid Frame Arch Bridge Based on Vibration Analysis

In the light of the deteriorations of concrete rigid-frame arch bridges,a spatial structure finite element model was established for the typical bridge of such type to analyze the relations between dynamic properties and structural damages of the bridge,in which particular efforts were made to study the influences of lateral connection system on the dynamic properties.The modal tests based on ambient vibration for the arch bridge and measurement of vibration response were carried out and compared to the results of the finite element analysis.The results of analysis indicate that the natural vibration frequency of the 1st order torsional vibration mode of deck of the rigid-frame arch bridge is very sensitive to the restrained action of the lateral connection system and can represent the characteristic parameters of structural damages of the type of the bridge.