Wind Load On Roof Truss

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.

Wind load on roof truss.

Where snow loads and wind loads exist a pitch of 1 4 the span is found convenient. Lateral load 3 roof rafters trusses and beams. In this section the uniformly distributed loads from the roof as well as from the wind are concentrated on the truss joints for subsequent analyses. 1 how to draw floor plan by hand.

Purlins are beams of light sections spanning between trusses carrying dead load of roof live load and wind load. Roof and wall sheathing gravity and wind loads floor diaphragms and shear walls in plane lateral overturninand g. Design of roof truss loading due to wind and dead loads applied to the inclined roof. In regions where snowfall is absent a pitch of 1 6 is reasonable.

In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant. Total roof load including roofing purlins sagrods and bracings 2 0 1 5 1 0 4 5 psf purlin spacing s p 21 54 truss spacing s t 30. The truss could be designed based on the assumption that the 25 psf roof snow load is a factored ground snow load in which case a ground snow load is back calculated using asce 7 based on the specified roof snow load pg 25 psf therein lies the problem with specifying only a roof snow load. In trusses of low pitch there is the advantage of reduced wind pressure.

Following this video is the design of purlin first then followed by the remaining structural members of the inclined roof. Usually velocity pressure coefficients at the mean roof height k h and at each floor level k zi are the values we would need in order to solve for the design wind pressures for this example since the wind pressure on the windward side is parabolic in nature we can simplify this load by assuming that a uniform pressure is applied on walls between floor levels. Calculation of point dead load. Wind uplift loads must be resisted by continuous load path connections to the foundation or until offset by 0 6d.

6the 0 6 reduction factor on d. Suction pressures on the roof.