Abstract
Dynamiccharacteristic analysis of bridge structure is the foundation of the seismicresponse analysis and seismic design, includes the calculation and analysis ofnatural vibration frequency and main vibration mode.The natural vibrationfrequency not only is the index of bridge structure rigidity,but also is the basisof identifying whether the bridge structure resonance occur. In this paper thehealth condition evaluation of highway bridges was carried out based on anambient test and finite element analysis, using finite element analysissoftware ANSYS calculates and analyzes the dynamic characteristic of bridgestructure, then gets the natural vibration frequency and main vibration mode ofbridge structure, finally compares with results of ambient tests. The resultsshowe that, structural dynamic stiffness of Rencungou Viaduct and YingyugouViaduct can meet design requirements; but structural dynamic stiffness ofLiaoyugou Viaduct is lower
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