The PEB Steel Structure of a Pre-Engineered Steel Building generally accounts for over 80% of the weight of the Pre-Engineered Steel Building. This 80% is an average and may change plus or minus 10% depending on the presence of mezzanines, crane runway beams, type of Panels used and the amount of building accessories that are included in a building. The unit of measure for PEB Steel Structures is metric ton (MT). As a general average, one square meter (1 m²) of PEB Steel Structure weighs 25 kg. Thus one MT of PEB Steel Structure = 40 (1000/25) m² of building foot print. The PEB Steel Structure is made up of frames, secondary members and steel standard buyouts.
Frames in the PEB industry often refer to primary built-up & hot rolled members. Constant depth or tapered depth built-up members generally account for over 90% of the weight of frames while hot rolled members generally account for the remaining 10%
Secondary Framing
Purlins, girts and eave struts are secondary structural members used to support the wall and roof panels. Purlins are used on the roof; girts are used on the walls and eave struts are used at the intersection of the sidewall and the roof.(Z section and C section)
Secondary members have two other functions:
• Act as struts that help in resisting part of the longitudinal loads that are applied on the building such as wind and earthquake loads
• Provide lateral bracing to the compression flanges of the main frame members thereby increasing frame capacity
Purlins, girts and eave struts are available in 1.5 mm, 1.75 mm. 2.0 mm, 2.25 mm, 2.5 mm and 3.0 mm thickness. pre-They come with a pre-galvanized finish, or factory painted with a minimum of 35 microns (DFT) of corrosion protection primer.
– Mezzanine Deck (0.7mm thick) used to support concrete slabs in second level flooring.
– Base angles, gable angles, and mezzanine edge angles.
– Valley gutters (0.7mm thick) in Multi Gable Buildings
Steel Standard Buyouts (SBO): These are items that are required in almost every PEB Steel Structure. They are manufactured by others and stocked by the PEB manufacturer. They include Anchor Bolts, Connection Bolts, Sag Rods and Cable Bracing Components.