An experimental study on dynamic characteristics of a single-box multi-cell composite girder bridge with corrugated steel webs

To study the dynamic characteristics of a multi-cell single-box continuous box girder bridge with corrugated steel webs, a scale-size test model beam was set up based on a non-navigable span bridge of Chaoyang Bridge in Nanchang Jiangxi province. The modal analysis methods of cross-power spectrum density method and transmissibility method were used to analyze the model beam and the real bridge. The first four order modal parameters of the model beam and the first seven 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 analyze their dynamic characteristics. Compared the test results and finite element calculation results of the real bridge, the error was small and vibration modes were consistent, excepted for the first order torsional vibration of the real bridge, because the dense beams between the south bridge and the north bridge were equipped to connect the two bridges, which led to the big errors. Compared the test results and finite element calculation results of the model beam, the error was small at low frequencies. The methods to set up the model beam and modal analysis results were effective, and at the same time the transmissibility method could be precise to identify the modal parameters of a bridge with corrugated steel webs. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.