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Wind and Structures
  Volume 27, Number 6, December 2018 , pages 399-416

Case study of random vibration analysis of train-bridge systems subjected to wind loads
Siyu Zhu, Yongle Li, Koffi Togbenou, Chuanjin Yu and Tianyu Xiang

    In order to reveal the independent relationship between track irregularity and wind loads, the stochastic characteristics of train-bridge coupling systems subjected to wind loads were investigated by the multi-sample calculation. The vehicle was selected as 23 degrees of freedom dynamical model, and the bridge was described by three-dimensional finite element model. It was assumed that the wind loads were random processes with strong spatial correlation, while the track irregularities were stationary random ones. As a case study, a high-speed train running on a cable-stayed bridge subjected to wind loads was studied. The effect of rail irregularities was deemed to be independent of the effect of wind excitations on the coupling system in the same wind circumstance for the same project, leading to the conclusion that the effect of wind loads and moving vehicle could be calculated separately. The variance results of the stochastic responses of vehicle-bridge coupling system under the action of wind loads and rail irregularities together were equivalent to the sum of the variance of the responses induced by each excitation. Therefore, when one of the input excitations is different, only the effect of changed loads needs to be assessed. Moreover, the new calculated results were combined with the effect of unchanged loads to present the stochastic response of coupling system subjected to the different excitations, reducing the cost of computations. The stochastic characteristics, the CFD (cumulative distribution function) of the coupling system with different wind velocities, vehicle speed, and vehicle marshalling were studied likewise.
Key Words
     train-bridge systems; stochastic characteristic; independent relationship; wind loads; track irregularity
Siyu Zhu: 1College of Environment and Civil Engineering, Chengdu University of Technology, 610059, Chengdu, Sichuan, P.R. China
Yongle Li, Koffi Togbenou and Chuanjin Yu: Department of Bridge Engineering, Southwest Jiaotong University, 610031, Chengdu, Sichuan, P.R. China
Tianyu Xiang: Department of Civil and Structural Engineering, The Xihua University, 610031, Chengdu, Sichuan, P.R. China

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