Wind Load On Roof Truss

A simplified procedure and an analytical procedure.

Wind load on roof truss.

If unbalanced snow loading isn t required or specified the truss designer may enter the 25 psf snow load as a top chord live load tcll set the load duration factor to 1 15 for snow and turn snow loading off completely. Following this video is the design of purlin first then followed by the remaining structural members of the inclined roof. Lateral load a pulling and pushing horizontal pressure that can cause a building to move off its foundation. Wind loads dead loads design of roof truss.

Effective wind area 225 33 sq ft. Purlins supporting corrugated sheeting 80 n m 2. Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off. Generally the following figures may be adopted.

Since trusses are spaced at 26ft hence this will be the length of purlins. Asce 7 10 provides two methods for wind load calculation. Types of wind load forces on buildings. Purlins supporting slate roof 120 n m 2.

Environmental loads created by snow wind and earthquake seismic forces. They must be specified by the building designer see the technical info section for more on design responsibilities. Tests were carried out in the 2 0 m high 2 5 m wide 22 m long boundary layer wind tunnel at the james cook university cyclone testing station australia. Shear load wind pressure that is horizontal and could make a building tilt.

Truss manufacturers and designers are not responsible for determining these loads for structures. Purlins supporting glazed roof 100 n m 2. 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. Wind tunnel tests a wind tunnel study to determine simultaneous loads at batten to rafter truss connections of a typical roof system was conducted.

Uplift load pressures from wind flow that cause lifting effects. The effective wind area should be the maximum of.