Abstract
To explore the influence of bridge wind barriers, with their specific opening shapes and arrangements, on bridge deck wind fields and vehicle driving stability under different crosswinds, five bridge wind barrier schemes were designed. For two incoming wind speeds, the wind speed at different heights over three traffic lanes and the aerodynamic six-component force of the vehicle model were measured, and the influence of the wind barrier parameters on the vehicle driving stability was analyzed. The equivalent wind speed reduction coefficient of the wind barrier was compared with the dimensionless coefficients of the aerodynamic side force, roll moment, and aerodynamic lift to verify the accuracy of the shielding effect evaluation indices. The final conclusions provide a useful reference for designing bridge wind barriers.
Highlights
IntroductionAs bridge spans have increased, the impact of wind loads on bridge structures and the safety of vehicles passing over bridges have received more attention from engineers [1]
As bridge spans have increased, the impact of wind loads on bridge structures and the safety of vehicles passing over bridges have received more attention from engineers [1].This is especially important in coastal areas with extreme weather conditions [2,3,4]
Bridge bridge wind wind barriers barriers use use the the vehicles bridge deck equivalent wind speed reduction coefficient as the wind shield performance bridge deck equivalent wind speed reduction coefficient as the wind shield performance evaluation index, index, but but the the influence influence of of bridge bridge wind wind barriers barriers on on vehicle vehicle stability stability on on bridge bridge evaluation decks is not clear. It is unknown whether the effects of bridge wind barriers are decks is not clear
Summary
As bridge spans have increased, the impact of wind loads on bridge structures and the safety of vehicles passing over bridges have received more attention from engineers [1]. Many researchers have used wind tunnel experiments to study the influence of the height and porosity of wind barriers on the wind resistance, and most of them used the wind speed reduction coefficient to evaluate the effect of each parameter on the wind resistance. Whether the influence of the wind barrier parameters on vehicle stability on that a wind barrier with 30% porosity and a height of 5 m provided the best wind-shielding bridges is consistent with the evaluation results of the equivalent wind speed reduction effect, and that the hole size has little effect on wind barrier efficiency [18,19,20,21,22]. The geometric scale ratio of the model was set to 1:10, and the maximum blocking rate of the model placed in the test section was 3.75%, which satisfied the test requirement that the maximum block rate be less than 5% [23]
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