2-DIMENSIONAL SIMULATION OF CANTILEVERED ROOFS IN ABL WIND AND DOWNBURST WIND

Abstract

The unsteady aerodynamic properties of a large-span cantilevered roof were studied by means of 2D forced oscillation simulations with the k-ω SST model. The roof was assumed to be rigid with a rotational degree of freedom. The effect of roof shape and downburst wind were analyzed and discussed. The result shows that 1) curved roofs were subjected to greater wind loads though their critical velocity for instability was higher than the plate roof in ABL wind or with a pitch angle of 20°, 2) the moment loads became greater and the critical velocity decreased in the downburst wind, especially for the case with a pitch angle of 20°, 3) the curved roof shape can affect the flow pattern and change the dynamic property of wind load.