With the large-scale construction of high-speed railway box girder bridges,the environmental noise caused by train passing has become one of the important factors restricting their development.In order to solve the problem of low frequency acoustic radiation induced by the trains passing through the box girder bridge,it is necessary to study the noise reduction measures of the box girder bridge.In this work,the high-speed railway box girder bridge with its upper plate reinforced by longitudinal ribs is taken as the research object.The coupling dynamics model of vehicle-rail-bridge and acoustic prediction model are established by using finite element method and boundary element method.The vibration acceleration,radiated acoustic power,linear sound pressure level and acoustic field distribution of the original box girder bridge and the reinforced box girder bridge are analyzed respectively,and the influence of the roof longitudinal reinforcement plate on the acoustic characteristics of box girder bridge is studied.The results show that the vibration acceleration of each plate of the box girder bridge decreases obviously after adding longitudinal ribs,and the amplitude decreases the most at the roof.The radiated sound power and sound pressure level of the box girder bridge are obviously reduced by adding longitudinal reinforcement plates,and the noise reduction effect is good.The effect of noise reduction at the top of the bridge is better than that under the bridge and on the side of the bridge.
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