Roof Truss Stress Points

Trusses that are banded together into a bundle are stiffer in comparison to a single truss but lifting a bundle of trusses by the peak can still cause undue stress and damage.

Roof truss stress points.

Bowstring trusses are usually analysed for direct stress as though the top chord were in a straight line between panel points. Stress points can indicate signs of roof damage winds. 1 to the curvature or may be solid timbers laid to the curved pattern with or without their top surfaces sawed to the curvature fig. When high winds hit.

For bundles of trusses greater than 45 and up to 60 in length at least two lift points are required. Trusses that are banded together into a bundle are stiffer in comparison to a single truss but lifting a bundle of trusses by the peak can still cause undue stress and damage. Roofs are designed to withstand weight and tension by dispersing it over trusses or rafters. Spanning from truss to truss which is meant to carry the load of the roofing material and to transfer it on the panel points is called a purlin.

The bending stresses about both. Apex peak the uppermost point of a truss. Top chords may be glued laminated fig. For bundles of trusses greater than 45 and up to 60 in length at least two lift points are required.

Hence the length of the purlin is equal to the width of the bay i e the spacing of the trusses. Axial force a push compression or pull tension acting along the length of a member. A percentage increase in the stress permitted in a member based on the duration of the load causing the stress acts on the member.