Roof Wind Load Formula

When building a structure it is important to calculate wind load to ensure that the structure can withstand high winds especially if the building is located in an area known for inclement weather.

Roof wind load formula.

The design wind load shall be calculated as. Q velocity pressure in psf given by the formula. 2 4 wind load on open building and other structures. In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant.

It provides the wind load calculations on uplift leeward windward and roof forces of a building. G c p i internal pressure coefficient. Q h velocity pressure at mean roof height h using the exposure defined in section 26 7 3. P q h g cn 30 8 1 where.

C n is net pressure coefficients include from top and bottom surfaces given in. G 0 85 as gust effect factor. Q 0 00256 k z k z t k d v 2 3 q q h for leeward walls side walls and roofs evaluated at roof mean height h. Once the wind speed has been calculated the user can provide additional information regarding the building such as building height type and cladding to get the wind pressure wind load based on asce 7 10 as 1170 and en 1991 provisions.

Http goo gl mrgajl for more free video tutorials covering structural design loading this video elaborates the calculation of wind pressure acting on roof. The formula for wind load is f a x p x cd x kz x gh where a is the projected area p is wind pressure cd is the drag coefficient kz is the exposure coefficient and gh is the gust response factor.