The main frame (rigid frame) is the primary structural member of the steel building system, consisting of columns and rafters. Columns transfer loads from main roof beams, trusses, or rafters to the foundations. Rafters are the main beams supporting the roof system. Main frames are normally connected to the foundation using anchor bolts in a configuration described as a pinned condition.
Endwall frames consist of endwall columns and rake rafters. Typically, end-frames only support half as much load as a main frame, so their components are often manufactured using the less expensive process of “cold forming” coils of steel in a roll former. Customers expecting to add to their building can order an expandable endwall. These are designed with the load-bearing capability of main frames so they can serve as interior frames when the building is expanded.
Bays and Framed Openings
Premier Building Systems offers several types of steel building framing options. All framing members are shop fabricated and ready for field bolt assembly.