Mechanism analysis of wind barrier on aerodynamic characteristics influence of the train on viaduct

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (3) : 66-71.

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Mechanism analysis of wind barrier on aerodynamic characteristics influence of the train on viaduct

HE Xu-hui, ZOU Yun-feng, DU Feng-yu

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Abstract

Based on the simultaneous pressure measurement, models of CRH2 type train and 32m pre-stressed concrete simply supported box beam viaduct at Beijing-Shanghai high-speed rail line are manufactured with geometric scale of 1:25, the influence of wind barrier on aerodynamic forces of each face and pressure distribution for vehicle under representative combination cases of model vehicles on double tracks on the model viaduct are investigated, according to which the aerodynamic influence mechanism of wind barrier can be analyzed, and the mechanism is interpreted from the perspective of hydrodynamics. Results show that the influence of wind barrier on the aerodynamic characteristics of upstream vehicle is significant, while the downstream vehicle is less affected because of it is in the wake. After the wind barrier are installed, the wind pressure on the windward side of upstream vehicle changes from positive to negative, which result in that the direction of lateral force on the windward side is opposite to that on leeward side, making the overall lateral force decreases. The lift on the roof increases about 50% because of the mean wind pressure decreases significantly, while the pressure on both the leeward side and underbody change slightly. Both porosity and height of wind barrier need to be optimized according to the specific environment, and people should pay attention to that windbreak effect is not equal to reduce the mean wind speed.

Key words

wind barrier / combination of vehicle and bridge / aerodynamic characteristic / wind tunnel test

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HE Xu-hui;ZOU Yun-feng;DU Feng-yu. Mechanism analysis of wind barrier on aerodynamic characteristics influence of the train on viaduct[J]. Journal of Vibration and Shock, 2015, 34(3): 66-71