Abstract
The Train-Track-Bridge coupling vibration theory was applied to analyze the dynamic characteristics of a U-beam serviced in Chongqing Rail Transit Line 1 in China. According to the analysis, for the U-beam form of this opening cross-section, the traditional 3D beam element model can only reflect the first-order vibration mode, but neglect the coupled local flexure and torsion vibration characteristics; the 3D beam element model overestimates the lateral stiffness of the bridge, and underestimates it’s lateral vibration; the 3D plate element model is reasonable in dynamic analysis of opening cross-section structure; the vibration of U-beam dominates in the frequency range off< 250, which is accurate and efficient to take into account this frequency range in the analysis of noise radiated by bridge structure.
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