Parametric analysis on buffeting performance of a long-span high-speed railway suspension bridge

Abstract

The buffeting performance of kilometer-level high-speed railway suspension bridges has a great impact on the smooth operation of high-speed trains. To investigate the buffeting performance of the structure significantly different from traditional suspension bridges, the first long-span high-speed railway suspension bridge, Wufengshan Yangtze River Bridge (WYRB), is taken as a numerical example to demonstrate the effects of structural parameters and wind field parameters on the buffeting responses. Based on the design information, the spatial finite element model (FEM) of WYRB is established before testing its accuracy. The fluctuating wind fields are simulated via both classical and stochastic wave based spectral representation method (SRM). Finite element method is further taken to analyze the parametric sensitivity on wind induced buffeting responses in time domain. The results show that the vertical displacement is more sensitive to the changing dead load than the lateral and torsional ones. The larger stiffness of the main girder and the lower sag-to-span ratio are both helpful to reduce the buffeting responses. Wind spectrum and coherence function are key influencing factors to the responses so setting proper wind field parameters are essential in the wind-resistant design stage. The analytical results can provide references for wind resistance analysis and selection of structural and fluctuating wind field parameters for similar long-span high-speed railway suspension bridges.

Keywords

high-speed railway suspension bridge / buffeting performance / numerical analysis / parametric analysis / wind field simulation

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