Abstract: An apparatus for fabricating, assembling and erecting the frame for a steel building, in which the frame is made up of a set of modular truss units which are joined together at the building site. The individual components of each truss unit are fabricated at a central location and are then shipped to an assembly location near the building site. At the assembly location, the components are welded together, prior to shipment to the building site, by use of special welding jigs.

Abstract: A building frame construction for a light metal building. The frame utilizes a series of transverse sub-frame assemblies forming side wall columns and main roof beams. Purlins and girts extend longitudinally between and are attached to the sub-frames to provide support for the side wall and rool panels; end wall columns and girts are provided to support the end wall covering. Each sub-frame comprises a plurality of modular truss units which are interconnected to form the unitary assembly of the sub-frame. Each truss unit comprises two main beams interconnected by struts and braces; the main beams are each formed from two angles aligned in a facing relation with a slot down the middle to permit attachment of any number of purlins or girts at any point along the beam.