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| Analysis of Structural Vibration Characteristics of Simply Supported Box Girder Bridge in Urban Rail Transit |
| LEI Xiao-yan, WANG Zhen-guo, LUO Kun |
| (Engineering Research Center of Railway Environment Vibration and Noise, Ministry of Education,East China Jiaotong University, Nanchang, Jiangxi 330013, China) |
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Abstract Abstract：Research purposes： Aiming at the problem of structural vibration of simply supported box girder bridge when the train passes the bridge，the previous simulation model that was established by SIMPACK is summarized and analyzed，and a wheel rail coupling simulation method is proposed based on the multi-body dynamics and finite element method. According to this method, a vehicle bridge coupled vibration analysis model is established, and the structural vibration characteristics of box girders are analyzed from two aspects of time domain and frequency domain, in order to provide a reference for the vibration reduction design of urban rail elevated box girder bridge. Research conclusions： (1) When the train passes at the speed of 40 km/h, the vertical vibration of wing is the strongest, the second is the web, and the vertical vibration of the box girder is more violent than the transverse vibration. (2) The increase of the train speed will not only increase the deformation of the box girder, but also cause the box girder to be subjected to greater impact energy. (3) When the vehicle passes through the bridge at low speed, the low frequency mode below 40 Hz contributes greatly to the vibration of the box girder; When the vehicle passes through the bridge at high speed, the first order mode contributes most to the vibration of the box girder，and the increase of vehicle speed can excite the higher order modal of box girder, which makes the local vibration of box beam strengthen. (4) The wheel rail coupling method is not only suitable for the coupling between vehicle and bridge, but also for the coupling between vehicle and the earth or other track structures.
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Received: 13 June 2017
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2017, Vol. 34 
