Wind load characteristics of long-span light steel structure plant under moving downburst
In order to study the wind load characteristics of large span light steel structure plant under moving downbursts wind field,determines the scale model based on the similarity criterion for the wind tunnel test,simulates the moving downburst wind field through the downburst generator,and investigates the changes of the wind pressure coefficient and wind force coefficient of the surface of the model under different offset distances(from 0 mm to 700 mm)and moving speeds(from 0 m/s to 0.2 m/s),and then finally analyzes them in comparison with the steady state.The results show that the larger the moving speed is,the later the wind pressure coefficient and wind force coefficient reach the peak value,and the lower the peak value is.Wind press coefficients for offset distance from 0 mm to 300 mm,the wind pressure coefficient changes with the increase of relative radial distance.In the case of a smaller offset distance,the peak value is higher.The wind pressure coefficient of the wall surface near the wind outlet has a negative peak value in the case of a larger offset distance.When the simulator is moved to the nearest position to the model,the wall surface is easy to be damaged.When the offset distance is different,the wind force coefficient varies greatly with the relative radial distance,and the light steel plant may be overturned or lifted up.The mean values of wind pressure and wind force coefficients are essentially the same for the moving and steady-state strike storm effects,but for the maximal and minimal values,the results are relatively larger and peak higher for the steady-state case.
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