Girder Roof Truss Design

Girder trusses have a long straight design.

Girder roof truss design.

The roofing system for such buildings is truss with roof covering material. Figure 6 1plane truss trusses are frequently used to span long lengths in the place of solid web girders. Girder trusses are designed to carry additional loads other than standard roof loads. A girder truss is designed to support other secondary roof supports.

An advantage of the truss design for roofs is that ducts and pipes that are required for operation of the buildings services can be installed through the truss web i e. The top chord is always in compression and the bottom chord is always in tension. Using these structures in roof design eliminates the need for a load bearing wall below resulting in open floor plans. These loads can be other trusses that attach by sitting on top of the girder or they may attach to the side of the girder using truss hangers.

The truss plate manufacturer s engineer usually reviews and seals the individual truss designs on behalf of the truss fabricator. Girders may also be designed to accommodate special applications or designs. Buildings constructed in l or t shapes use girder truss systems where the roof changes direction. Typically the building designer or builder will contract with the truss fabricator who will supply a truss layout and a structural design of each significant element of the roof system.