Abstract：To study the dynamic characteristic of multi-cell single-box continuous box girder bridge with corrugated steel webs, based on the non-navigable span bridge of Chaoyang Bridge in Nanchang Jiangxi province, a scale-size test model beam was set up. The modal analysis methods of cross-power spectrum density method and transmissibility method were used to text the model beam and the real bridge, the fourth order modal parameters of the model beam and the seventh order modal parameters of the real bridge were identified; The software ANSYS was used to build up the spatial finite element model of the model beam and the real bridge and analysis their dynamic characteristics. Compared the test results and finite element calculation results of real bridge, the error was small and vibration mode were consistent, excepted for the first order torsional vibration of real bridge, because of the dense beams between south bridge and north bridge were equipped to connect the two bridges, which led to the error was big;Compared the test results and finite element calculation results of model beam, the error was small of it’s low frequencies.The methods to set up the model beam and modal analysis results were effective, and at the same time transmissibility method could be precise to identify the modal parameters of bridge with corrugated steel webs.
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