Effect of wind barrier's height on train-bridge system aerodynamic characteristic of cable-stayed bridge for urban railway transportation

In order to consider the effects of wind barrier's height on both bridge deck and train, a method that combines wind tunnel test and numerical simulation was adopted to study the aerodynamic coefficients of bridge deck and train and the flow field around train-bridge system with wind barriers at different heights. The results show that with the increase of wind barrier's height, aerodynamic coefficient of the bridge increases obviously, and yet aerodynamic coefficient of the train decreases. On the contrary, lift coefficient of bridge and train is almost unchanged. The wind barrier's height has a more remarkable influence on the aerodynamic force on the train in windward cases than that in leeward cases. Moreover, the wind barrier's height can impact the flow field around train-bridge system. With the increase of wind barrier's height, the positive pressure zone on the windward side of the bridge deck increases obviously. Besides that, the wind pressure distribution around train depends not only on the wind barrier's height but also on the position of the train on bridge deck. © 2017, Central South University Press. All right reserved.