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To investigate vehicle trigger the box-bridge girder vibration and low frequency noise problem. This paper is divided into two parts to study, the first part is collecting the exciting force for large vehicle ,the second part is an elevated bridge finite element analysis. By field measurement, this paper discusses the measured whether the trend coincide with the simulation results. In this paper, measuring for large vehicle excitation force at No. 62 highway and comparison with other vehicles exciting force literature , The result show that the vehicle exciting force is depend on the vehicle weight, large vehicles caused by exciting force significant vibration frequency is about 10~12.5 Hz, small vehicles is about 16~31.5 Hz .It is the unique spectrum of the force for the vehicle. The summarized results verify that let the vehicle excitation force spectrum trend changed is caused by the gross vehicle weight mainly . Through the noise of the elevated bridge structure of the simulation of the railway system ,and summarized the results can be found in the elevated bridge structure-born noise is depend on the total weight of bridge. when the bridge is more heavier ; the structure-born noise is more smaller ;it also depend on the bridge of cross section . The correlation between the structure-born noise and the form of bridge columns (RC pier columns, steel columns)is not obvious. Keypoint: box-bridge girder、excitation force、structure-born noise.
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