Merits of Pre-Engineering building system

In structural engineering, a pre-engineered building (PEB) is designed by a manufacturer to be fabricated using a pre-determined inventory of raw materials and manufacturing methods that can efficiently satisfy a wide range of structural and aesthetic design requirements. Within some geographic industry sectors, these buildings are also called Pre-Engineered Metal Buildings (PEMB) or, as is becoming increasingly common due to the reduced amount of pre-engineering involved in custom computer-aided designs, simply, Engineered Metal Buildings (EMB). Merits of pre-engineering building
Historically, the primary framing structure of a pre-engineered building is an assembly of “I” shaped members, often referred to 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. Some manufacturers 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.

There are many advantages of pre-engineered building systems, but all advantages lead to reduced construction time. Following are advantages of Pre-Engineered Building Systems:

Flexibility of expansion:

Buildings can be easily expanded in length by adding additional bays. Also, expansion in width and height is possible by pre-designing for future expansion.

Low maintenance:

Buildings are supplied with high-quality paint systems for cladding and steel to suit ambient conditions at the site, which results in long durability and low maintenance coats.

Architectural versatility: 

Building can be supplied with various types of fascias, canopies, and curved eaves and are designed to receive precast concrete wall panels, curtain walls, block walls and other walls systems.

Lower cost:

Due to the systems approach, there is a significant saving in design, manufacturing and on-site erection cost. The secondary members and cladding nest together reducing transportation cost.

Single source responsibility:

As the complete building package is supplied by a single vendor, the compatibility of all the building components and accessories is assured. This is one of the major benefits of the pre-engineered building systems.

For more information Materials used for pre-engineered buildings

  • Steel / Stainless steel
  • Galvalume roof sheeting
  • Stainless steel capped fasteners
  • Silicon zed polyester baked-on enamel paint

The merits of pre-engineered buildings

  • Fast erection
  • Low cost if choosing a manufacturer’s standard package/inventory and no add on
  • Open clear span
  • Can be easily expanded to grow with needs
  • The disadvantages of pre-engineered buildings
  • Marginal design, material, and construction
  • Not energy efficient
  • Higher lifetime maintenance
  • Not durable for long term use, generally last 10 to 15 years
  • May not include all construction/fit-up needed for the building to serve the intended purpose.
  • No secondary roof membrane
  • Usually no internal finished walls
  • Pre-engineered steel fabric buildings vs. Conventional steel buildings

Mezzanine Floor System in Pre-engineered Buildings

The word mezzanine comes from Italian mezzano “middle”. A mezzanine floor is an intermediate floor between main floors of a peb building, and therefore not counted as overall floors of a building.

Generally, the mezzanine frame is connected to the main rigid frame columns for lateral stability. This mezzanine framing consist of profiled steel deck, beams, joists and intermediate support columns. Mezzanine beam and joists are designed and analyzed as simple span members.

The Standard Green Brick Mezzanine Framing System consists of a steel deck supported by joists framed onto main mezzanine beams. If required by design loads, the main beams shall also be supported by intermediate columns. The economy of a mezzanine system is affected by the applied loads (dead, live and collateral) and mezzanine column spacing.

Mezzanine Beam connection to main frame column

If possible, the primary mezzanine beams should run across the width of the building and be located under the main frame rafters. Joists should run parallel to the roof purlins along the length of the building.

Benefit of Mezzanine Flooring System

  • Mezzanine system in a warehouse effectively doubles the capacity of the area where the mezzanine floor is built. Some of the Mezzanine are built to accommodate light machinery and office space, while some are used for temporary or long-term storage of supplies or equipment.
  • These mezzanines can be built in square, rectangular and irregularly-shaped configurations.
  • They can be structural, as they can be built into the structure of a building.
  • Mezzanines floor are often grated and they are usually much smaller in terms of area than the floors or stories below them
  • Multi-level mezzanine, interior equipment platforms, catwalks and staircases are now also accommodated.

What are the Basic Components in Pre Engineered Buildings?

Pre-engineered Buildings are very ideal for offices, houses, showrooms, warehouses, shop fronts etc. The application of pre-engineered concept is very economical and speedy. These Buildings constructed in short time (i.e. less than half the normal time of traditional construction) when complimented with other engineered sub-systems.

There are nine major components in pre-engineered buildings:

  • Main framing or vertical columns
  • End wall framing
  • Purlins, girts and eave struts
  • Sheeting and insulation
  • Crane system
  • Mezzanine system
  • Paints and finishes

Main framing or vertical columns

Main frames include steel rigid frames of the building. The PEB steel rigid frames include tapered columns and tapered rafters. These tapered sections are fabricated using the state of art technology while the flanges are welded. The frame is then erected by bolting the splice plate of connecting section together.

End Wall Framing

The endwall frame of Prefabricated building is designed as a main rigid frame. The beam endwall system of framing consists of columns with pinned ends, supporting horizontal beams as known as endwall rafters.

Purlins, girts and eave struts

Purlins, girts and eave struts are the secondary cold-formed members. No welding is involved in this preparation. They are prepared by just bending the steel coil in order to give it a desired shape (Z-shape for purlins and girts, and C-shape for eave struts).

Sheeting and Insulation

The steel sheets are normally galvanized profile sheets permanently colour coated, plain or sheets can be coated with special paints for better anti-corrosion properties. These buildings are properly insulated through insulation slab/rolls and then the roofing steel sheet is fixed over it.

Crane System

Crane system in industrial building is used to improve material handling productivity allowing more utilization of space by reducing or eliminating traffic due to forklifts etc. This crane runway beams are supported by built-up sections with cap channels.Crane system in industrial building is used to improve material handling productivity allowing more utilization of space by reducing or eliminating traffic due to forklifts etc. This crane runway beams are supported by built-up sections with cap channels.

Mezzanine System

The Standard mezzanine framing system consists of steel deck supported by joists framed onto main mezzanine beams. The economy of mezzanine system is affected by the applied loads and mezzanine column spacing.

Paints and finishes

Pre-painted steel is produced on modern, high-speed coil painting lines where surface preparation prior to painting, paint application & paint curing is done on a highly automated line under optimum condition.