LAUSR

Abstract This study investigates the structure-borne noise characteristics and a control measure of the long-span steel truss cable-stayed bridge (LSTCB) which are induced by running trains in urban rail transit. A frequency-domain theoretical model of a vehicle–track coupling interaction system, in which the vibration reduction track structure of damping pad floating slab (DPFS) are taken into account, is firstly established, from which the wheel–rail dynamic force, the force transmission rate, and the force transmitted to the bridge can be obtained. After that, a vibration model of the LSTCB and a noise model of the steel truss girder are established, which are based on the refined finite element method (FEM) and statistical energy analysis (SEA) method respectively, to predict the structure-borne noise of the LSTCB. Next, the near-field noise test of an LSTCB under DPFS at an urban rail transit line, are analyzed and used to validate the prediction model. Then, the structure-borne noise characteristics of the LSTCB and noise reduction effect of DPFS are studied. It is found that the wheel-rail transfer to the track slab and bridge are influenced by the track structure system; the attenuation rate of the near-field sound pressure level (SPL) is relatively slow in the range of 20–100 Hz, fast after 100 Hz, and faster than the far-field SPL; the vibration energies that input to the LSTCB are mainly distributed in the bridge deck, longitudinal web, and transverse web; the sound radiation capability of the bridge deck is stronger than that of other subsystems; compared with the common track structure (embedded sleeper), the track structure of DPFS can reduce the overall sound pressure level of the LSTCB by 10–13 dB(A).