Determining wind pressure coefficients on sheds with arched roofs using wind tunnel tests and numerical modeling

Structures with large opening roofs are vulnerable to wind, in these structures due to the low dead load, the wind load has a greater effect on these types of structures. In the calculation of wind force, one of the coefficients related to the geometry of the structure is the pressure coefficient (Cp), which is provided for some common structures in the loading regulations. Arch opening of 0.1, 0.2 and 0.3 was done using wind tunnel test and numerical modeling based on Computational Fluid Dynamics (CFD) method using ANSYS software and wind pressure coefficients on these structures are presented, it can be seen that with increasing The ratio of the height to the opening of the arch of the maximum coefficients of negative wind pressure (suction), increased in such a way that on the middle axis of the structure in the state of α = 90o, the maximum negative pressure in the structure S-1, S-2, 3-S, is equal to -2 and It is -1.7 and -1.6. The pressure coefficients on the sides facing the wind show a positive number, which indicates the pressure on these surfaces, the maximum positive pressure occurs at α=90o (the state where the direction of the wind is perpendicular to the shed) and in this case the pressure coefficient is equal to +1. In structure S-1 (height-to-opening ratio 0.3), the maximum deformation created for the wind application angle is α=40o, which is 20% more than α=90 o.