Influence of wind guide railing parameters on wind-vehicle-bridge coupling vibration of steel truss bridge
In order to explore the influence of the parameters of the wind guide railing on the wind-vehicle-bridge coupling vibration of the steel truss bridge,taking a typical ultra-high pier steel truss bridge as the background,the wind tunnel tests and CFD numerical simulations were carried out on the segment model with a new type of wind guide rail.The parameters of the wind guide rail and the three-component coefficients of the vehicle and the bridge under the wind attack angle were obtained.On this basis,the space coupling vibration simulation analysis model of wind-vehicle-bridge system was established.The influence of different guide rail spacing,windshield angle and wind attack angle on the dynamic response of vehicle-bridge system under different wind speeds was analyzed,and obtained the optimal guide rail parameters.The results are drawn as follows.With the increase in the spacing of wind guide rails,the bridge resistance coefficient decreases slowly,and the train resistance coefficient and lift coefficient show an increasing trend.With the increase of the angle of the windshield,the variation of the three-component force coefficient of the bridge is small,and the train resistance coefficient and lift coefficient show an increasing trend.The wind guide railing has little influence on the variation trend of the three-component force coefficient of the bridge with the wind attack angle,and has a great influence on the variation trend of the train resistance coefficient with the wind attack angle.For such bridges,the windshield effect is more obvious when the spacing of the wind guide railing is 60～75 cm.The wind guide railing with 60 cm spacing can reduce the train response to the greatest extent,and does not significantly increase the bridge response.When the windshield angle is 10°～20°,the windshield effect is obvious.The wind guide rail with 10° windshield angle can give full play to the windshield effect and control the train response at a low level,and does not significantly increase the bridge response.Influence of windshield angle on vehicle-bridge system vibration is less than that of guide rail spacing.The guide rail can effectively reduce the derailment coefficient of the train under three wind attack angles and the wheel load reduction rate under-7° attack angle.But it can increases the wheel load reduction rate under-7° attack angle and 0° attack angle and the mid-span transverse displacement of the bridge.The research results can provide a reference for further optimizing the parameters of the wind guide railing and ensuring the safe operation of the train on the ultra-high pier steel truss bridge.
万方数据
维普
