Triangular Roof Truss Design

Basic types of stresses loads and roof truss design diagram 1 shows a basic triangular roof with two top chords called rafters in a conventional roof and a bottom chord or ceiling joist.

Triangular roof truss design.

The pitched or common truss is characterized by its triangular shape. A mono truss is a one sloped truss that forms a right angle triangle. Its conventional triangular truss design is that the two sides are sloping up to the apex above with the struts known as the upper chords leading down from it. Apr 25 2019 explore robert heimbigner s board roof truss design followed by 984 people on pinterest.

It is most often used for roof construction. Typically the upper chords have different lengths in this particular type of truss that make the apex off center. It s often used for sheds garages or extension of an existing roof. These are attached to the horizontal beam thus making up the triangle s base.

The chord size and web configuration are determined by span load and spacing. When the roof is subjected to a load the top chords are put under bending and compression forces and transmit the roof loads down to the supports. Parallel trusses are used for deep roofs whereas triangular are usually employed in the trusses with steep pitches. It can be said in the case of steel roof truss design calculations that the cost of truss should be equal to twice the cost of purlins and the cost incurred on the roof covering.