PEB (Pre-engineered buildings)
What is a PEB?
The Pre-Engineered Building (PEB) system is a building that includes a structural system and quite often roof and wall cladding and other accessories. Structures are normally designed by the PEB fabricator.
The building system consists of rigid frames that are fabricated from plated steel. Secondary members from cold formed C- and Z sections are used as purlins and girts.
PEB are up to 30% lighter than conventionally designed steel structures due to efficient use of steel. Primary framing members are tapered (varying depth) built-up sections, with larger depths in the areas of highest stresses and internal forces. These sections are engineered to maximise optimal section usage. Secondary members are light gage (light weight) roll- formed (low labour cost) “Z” or “C” shaped members.
In the conventional design of steel structures, primary steel members are selected from standard hot rolled “I” sections, which are, in many segments of the portal frame, heavier than what is required, when looking at internal forces. Members have constant cross-sections regardless of the varying magnitude of the local (internal) stresses along the member length.
PEB vs Conventional Steel Structure
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PEB and Hybrid Structures
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Main PEB Components
The main components of a PEB are fabricated within a controlled environment, using state of the art equipment – with precise engineered design and according to the client’s specifications.
Pre-engineered buildings have two main components:
Primary built up members:
Columns: vertical members from the ground up. Rafters: horizontal members connecting the top of the columns. Normally fabricated from high grade steel S355JR (yield stress of 355 MPa), confirming to ASTM A572M.
Secondary members:
Purlins, Girts and Eave struts. These sections are cold formed and normally “Z” and “C” shaped. Sections are rolled from pre-galvanised coils with a yield stress of between 230 MPa and 400 MPa, depending on design requirements. Thickness of material varies from 1.9 to 2.5mm. All fixing holes are CNS pre-punched during fabrication.
Cladding
Shell of building
Single Skin Profiles:
Concealed fix sheeting:
Single skin sheet rolled formed on site to ensure no end lapping or positive fix penetration through profile. Different concealed fix profiles with various thicknesses and coatings are available. Ideal for industrial buildings and warehouses.
Positive fixed sheeting:
Many standard profile types are available with various thicknesses and coating options. Ideal for agricultural buildings and smaller structures.
Sandwich/ Insulated panels:
Wall Panels:
Various profile options available. Used on sides and internal walls in buildings.
Roof Panels:
Normally a ribbed profile.
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Why use PEB?
Single source engagement from Engineering to installation on site.
Single source responsibility.
Expert design capabilities.
High fabrication accuracy due to controlled production environment.
Effectively zero raw material waste.
Up to 30% more cost effective than conventional steel buildings.
Engineered to maximize optimal section usage.
Large clear spans (up to 80m) without internal columns.
Quicker erection times on site when compared to lattice trusses.
Advanced design flexibility to client’s requirements.
