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Wind and Structures
  Volume 17, Number 3, September 2013 , pages 299-315

Numerical simulation of wind loading on roadside noise mitigation structures
K.T. TSE, Yi Yang, K.M. Shum and Zhuangning Xie

    Numerical research on four typical configurations of noise mitigation structures and their characteristics of wind loads are reported in this paper. The turbulence model as well the model parameters, the modeling of the equilibrium atmospheric boundary layer, the mesh discretization etc., were carefully considered in the numerical model to improve the numerical accuracy. Also a numerical validation of one configuration with the wind tunnel test data was made. Through detailed analyses of the wind load characteristics with the inclined part and the wind incidence angle, it was found that the addition of an inclined part to a noise mitigation structure at-grade would affect the mean nett pressure coefficients on the vertical part, and that the extent of this effect depends on the length of the inclined part itself. The magnitudes of the mean nett pressure coefficients for both the vertical part and the inclined part of noise mitigation structure at-grade tended to increase with length of inclined part. Finally, a comparison with the wind load code British/European Standard BS EN 1991-1-4:2005 was made and the envelope of the mean nett pressure coefficients of the noise mitigation structures was given for design purposes. The current research should be helpful to improve current wind codes by providing more reasonable wind pressure coefficients for different configurations of noise mitigation structures.
Key Words
    wind loads; noise mitigation structure; SST k-e turbulence model; equilibrium atmospheric boundary layer
K.T. TSE and Yi Yang : Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
Yi Yang and Zhuangning Xie : State Key Laboratory of Sub-tropical Building Science, South China University of Technology,Guangzhou 580641, China
K.M. Shum : The CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology,Clear Water Bay, Kowloon, Hong Kong

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