Experimental Study on Vibration and Noise of Continuous Composite Box Girder of Railway Bridge

Research purposes：To study the vibration and noise response of steel-concrete continuous composite beam bridges under railway heavy loads，a railway steel-concrete continuous composite beam bridge with a span of（40+50+ 40）m on a certain passenger dedicated line was used as the engineering background to conduct on-site testing of structural vibration and noise. The valid data for 16 trains of different formations under operating conditions has been recorded，with train speeds ranging from 160 to 210 km/h. Based on the valid data，the characteristics of vibration and noise of railway composite beam bridges were analyzed and discussed. This research can provide data reference for the research and engineering application of acoustic and vibration response of railway composite structure bridges. Research conclusions：（1）The results showed that the dominant frequency range of vehicle-induced vibration of the composite bridge was 30 to 2 000 Hz，the peak frequency of vertical vibration of the bridge appeared at 100 Hz，and the peak frequency of transverse vibration of the bridge appeared at 63 Hz.（2）The dominant frequency range of A-weighted sound pressure level at each field point in the test was 63 to 1 250 Hz.（3）The local vibration response of the steel web in the steel-concrete composite bridge was prominent，and the acceleration effective value can reach 6 to 10 m/s2，significantly higher than the vertical and transverse vibration of the bridge.（4）The noise pressure level of the railway boundary field point can reach 75 to 78 dB（A）.（5）The research results can provide measured data support for railway steel-concrete composite beam bridge engineering and research. © 2024 Editorial Department of Journal of Railway Engineering Society. All rights reserved.