Pre-Engineered Steel Structure
A Pre-Engineered Building (PEB) is designed by a PEB supplier or PEB manufacturer, to be fabricated using best suited inventory of raw materials available from all sources and manufacturing methods that can efficiently satisfy a wide range of structural and aesthetic design requirements.
The primary framing structure of a pre-engineered building is an assembly of I-shaped members, often referred as I-beams. In pre-engineered buildings, the I-beams used are usually formed by welding together steel plates to form the I-section. The I-beams are then field-assembled (e.g. bolted connections) to form the entire frame of the pre-engineered building. We taper the framing members (varying in web depth) according to the local loading effects. Larger plate dimensions are used in areas of higher load effects.
Other forms of primary framing can include trusses, mill sections rather than three-plate welded, castellated beams, etc.
Typically, primary frames are 2D type frames (i.e. may be analyzed using two-dimensional techniques). Advances in computer-aided design technology, materials and manufacturing capabilities have assisted a growth in alternate forms of pre-engineered building such as the tension fabric building and more sophisticated analysis (e.g. three-dimensional) as is required by some building codes.
Cold formed Z- and C-shaped members may be used as secondary structural elements to fasten and support the external cladding.
Roll-formed profiled steel sheet, wood, tensioned fabric, precast concrete, masonry block, glass curtain wall or other materials may be used for the external cladding of the building.
In order to accurately design a pre-engineered building, our engineers consider the clear span between bearing points, bay spacing, roof slope, live loads, dead loads, collateral loads, wind uplift, deflection criteria, internal crane system and maximum practical size and weight of fabricated members.
Pre-engineered building suppliers have developed pre-calculated tables for different structural elements and computer-aided custom designs in order to select the most efficient I beams size for our projects.
Pre-engineered buildings can be adapted to suit a wide variety of structural applications, the greatest economy will be realized when utilizing standard details. An efficiently designed pre-engineered building can be lighter than the conventional steel buildings by up to 30%. Lighter weight equates to less steel and a potential price savings in structural framework.
The Steel Division Manager is responsible for aspects such as aesthetic, dimensional, occupant comfort and fire safety. When a pre-engineered building is selected for a project, the Steel Division Manager accepts conditions inherent in the supplier’s product offerings for aspects such as materials, colours, structural form, dimensional modularity, etc.
Despite the supplier’s standard assembly details, the Steel Division Manager remains responsible to ensure that the supplier’s product and assembly is consistent with the building code requirements (e.g. continuity of air/vapor retarders, insulation, rain screen; size and location of exits; fire rated assemblies) and Client/Owner expectations.
Many jurisdictions recognize the distinction between the project engineer and our Structural Engineer. The principal differences between these two entities on a project are the limits of commercial obligation, professional responsibility and liability.
The Structural Engineer specify the design parameters for the project (e.g. materials, loads, design standards, service limits) and ensure that the element and assembly designs by others are consistent in the global context of the finished building.
In the context described, the Steel Division Manager and Structural Engineer are the designers of the building and bear ultimate responsibility for the performance of the completed work.