Determination of wind pressure coefficients on spherical domes called onion domes (defined in standard 400)

Document Type : Research Article


Department of Civil Engineering, Damghan Branch, Islamic Azad University, Damghan, Iran


Wind force is one of the lateral loads in the design of structures. One of the parameters for calculating wind force on structures is called pressure coefficient (CP), which is related to the geometry of the building. The design codes provide the pressure coefficient of conventional buildings. In the absence of these coefficients in the design codes, wind tunnel testing or numerical modeling should be used. Numerical method based on computational fluid dynamics (CFD) has been used in modeling to simulate wind flow. The model used in computational fluid dynamics in this research is the K-ε (Standard) model. The sphere is modeled with a diameter of 50 cm and the results of numerical modeling are compared with the results of the wind tunnel test presented in reference [2]. The dome is made with different height to span ratio, with increasing height-to-span ratio to maximum The negative pressure (suction) obtained at an angle of 90o increases as this value reaches –2.24 in dome 122, and it is also observed that at an angle of 150o to 180 o the pressure coefficient is constant for all domes. Finally, the equation the wind pressure coefficients of this type of dome is presented.


Main Subjects

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