PRE ENGINEERED BUILDINGS

Pre Engineered Buildings (PEB) are the buildings which are engineered at a factory and assembled at site. Usually PEBs are steel structures. Built-up sections are fabricated at the factory to exact size, transported to site and assembled at site with bolted connections. This type of Structural Concept is generally used to build Industrial Buildings, Metro Stations, and Warehouses etc.

The adoptability of PEB in the place of Conventional Steel Building design concept resulted in many advantages, including economy & easier fabrication. These type of building structure can be finished internally to serve any functions that is actually help in low rise building design. Examples of Pre-Engineered Buildings are warehouses, Canopies, Factories, Bridges etc.

Pre-Engineered Steel Buildings use a combination of built-up sections, hot rolled sections and cold formed elements which provide the basic steel frame work with a choice of single skin sheeting with added insulation or insulated sandwich panels for roofing and wall cladding. The concept is designed to provide a complete building envelope system which is air tight, energy efficient, optimum in weight and cost and, above all, designed to fit user requirement like a well fitted glove.

These Pre-Engineered Steel Buildings can be fitted with different structural accessories including mezzanine floors, canopies, fascias, interior partitions, crane systems etc. The building is made water-tight by use of special mastic beads, filler strips and trims. This is a very versatile building system and can be finished internally to serve any required function and accessorized externally to achieve attractive and distinctive architectural styles. It is most suitable for any low-rise building and offers numerous benefits over conventional buildings.

Pre-engineered buildings are generally low rise buildings; however the maximum eave heights can go upto 25 to 30 metres. Low rise buildings are ideal for offices, houses, showrooms, shop fronts etc. The application of pre-engineered concept to low rise buildings is very economical and speedy. Buildings can be constructed in less than half the normal time especially when complimented with other engineered sub-systems.

The most common and economical type of low-rise building is a building with ground floor and two intermediate floors plus roof. The roof of a low rise building may be flat or sloped. Intermediate floors of low rise buildings are made of mezzanine systems. Single storeyed houses for living take minimum time for construction and can be built in any type of geographic location like extreme cold hilly areas, high rain prone areas, plain land, extreme hot climatic zones etc.

Various systems in PEB

Primary System

Primary system consists of tapered or parallel columns and tapered beams which are called as rafters. The base of the columns can be either pinned or fixed based on the load requirements. Lengths of these members are generally restricted to 12m for ease of transports. Joints are connected with high tensile bolts.

Secondary System

Secondary structural system consists of Purlins (roof), Girts (side cladding) and Eave struts (at eaves) stiffened with sag rods. This also includes the flange stiffeners which connects the untied flanges of the PEB primary structure to secondary system. Some of the commonly used secondary system are Lipped C or Lipped Z purlins, MS rods and Lipped Angles. These are generally cold formed sections conforming to IS: 801.

Wind Bracing System

There are two types of wind bracing systems.The first one is Rod bracing system and the second one is portal system. Each type of system is chosen based on the design and functional requirement of the structure.

Roofing & Cladding System

Roofing and cladding system can be with single skin zinc and aluminum coated steel sheets, GI sheets, both of which could be bare or color coated; It could with double skin sheets with or without insulation material in between; It could be sandwich panels with steel sheets outside and PUF/PIR/Mineral Wool/Glass wool core inside. Roofing and cladding could have skylights with Poly Carbonate/ PVC or FRP sheets.

Accessories

Accessories include, Turbo Ventilators, Ridge vents, Flashings, trims, Gutters, Down pipes, ladders, Louvers etc.

Finishing

Primary structural members are generally finished with shot peening, Sand blasting, and two coats of anti corrosive primers, followed by two coats of paints to specifications. Secondary members or either painted after sand blasting or Galvanized to 275 gsmor above based on the requirement.