Wind Load On Sloped Roof

For dead loads you are correct.

Wind load on sloped roof.

Per code section 6 1 4 1 the minimum wind load to be used in the design of the mwfrs shall not be less than 10 psf multiplied by the area of the building or structure projected onto a vertical plane normal to the assumed wind direction. The present study demonstrates the pressure variations due to wind load on the pyramidal roof of a square plan low rise building with 15 wall openings through cfd computational fluid dynamics simulation. The upward movement of the wind exerts an uplift load on the roof and the roof must be able to resist this uplift. Technically you should use the actual rafter length when adding up the weight of roofing materials.

After you obtain the roof slope factor from those sections in asce 7 10 the balanced design snow load for the sloped roof can easily be calculated using equation 7 4 1. Extreme wind loads on monosloped roofs and sawtooth roof buildings and by. The simplified procedure is for building with a simple diaphragm roof slope less than 10 degrees mean roof height less than 30 feet 9 meters regular shape rigid building no expansion joints flat terrain and not subjected to special wind condition. If your structure has a sloped or flat roof you still need to calculate the flat roof snow load.

Roof shape and slope are both important parameters for the safety of a structure especially when facing wind loads. The author defined pressure zones for the windward span middle spans and leeward span of sawtooth roofs based on wind tunnel tests allow more. This formula takes a few more parameters into account for wind load. Asce 7 10 provides two methods for wind load calculation.

It also describes wind uplift design of roof assemblies in accordance with asce 7 16 with several illustrative examples. Boca also allows you to reduce the snow load for roofs with slopes greater than 30 degrees presumably because snow will slide or blow off steeply pitched roofs. Asce sei 7 16 contains a number of revisions in the wind load chapters of the stan dard. The boca code recognizes this and allows you to use the horizontal projection of the roof when calculating snow loads.

However in my practice i typically use the horizontal run of the roof for both. This formula is generally used to calculate wind load on antennas. Http goo gl mrgajl for more free video tutorials covering structural design loading this video elaborates the calculation of wind pressure acting on roof. Iv implication current design provisions in asce 7 for monosloped roofs may be inadequate.

A simplified procedure and an analytical procedure.