Pre Engineered Building System

 Pre Engineered Building System  Pre Engineered Building System



RBS produces a wide range of pre engineered building systems including clearspan, rigid frame, modular-rigid frame, tapered beam, and lean to. All the above mentioned systems are available in standard or long span options. Crane support systems and mezzanines are also included as a part of the complete building package. Apart from the systems available at RBS outlets, pre engineered buildings can also be designed as per the client requirement, with the help of design and steel optimization.

The basic building parameters are:

Pre Engineered Building Length

  •    The distance between the outside flanges of the end wall columns in opposite end walls is considered the building length.
  •   End bay length is the distance from outside of the outer flange of end wall columns to the center line of the first interior frame columns.
  •   Interior bay length is the distance between the centre lines of two adjacent interior main frame columns.
  •   The most economical bay length is 6m (or 7.5 m). However bay length can be extended upto 15 meters.

Building Height

Pre engineered building height is the Eave height which is usually the distance from the bottom of the main frame column base plate to the top outer point of the eave strut.


Roof Slope (x/10)

This is the angle between the roof and the horizontal. The most common roof slopes are 1/10 and 1/2-0. Practically the roof slope can be designed according to the requirements of the customer.


Primary Framing System




Secondary Framing System




Design Load

The building loads can be calculated the suggested code. The metal building can be designed according to the Indian Standard Codes or American Codes, as required.


Design Criteria

  •   DESIGN METHOD: Allowable stress design method is used as per the AISC specifications.
  •   DEFLECTIONS: Unless otherwise specified, the deflections will go to MBMA, AISC criteria and standard industry practices.
  •   PRIMARY FRAMING: Moment resisting frames with pinned or fixed bases.
  •   SECONDARY FRAMING: Cold formed Z sections or C sections for purlins or girts designed as continuous beams spanning over rafters and columns with laps.
  •   LONGITUDANAL STABILITY: Wind load on building end walls is transferred through roof purlins to braced bays and carried to the foundations through diagonal bracing.


Design Software

We use the latest software which is used to design STAAD 2006/2007.

Design Process

The frame related data is assembled on the basis of number of frame members, number of joints, number of degrees of freedom, the conditions of restraint and the elastic properties of all the parts. The overall joint stiffness matrix is obtained on the basis of the above data by summation of individual stiffness matrices considering all the possible displacements. The load vector is then generated based on the loading data and the unknown displacements are obtained by the inversion of the overall joint stiffness matrix and multiplying it with the load vector.

Applications of Pre-Engineered Buildings

  •   Warehouses
  •   Factories
  •   Small to Big Workshops
  •   Offices in Single or Mezzanine Floor
  •   Gas Stations
  •   Vehicle Parking Sheds
  •   Showrooms
  •   Aircraft Hangars
  •   Metro Stations
  •   Schools and Banquet Halls
  •   Recreational Places
  •   Indoor Stadiums
  •   Outdoor Stadium Canopies
  •   Railway Platform Shelters


Advantages of Pre-Engineered Buildings

  •   REDUCED CONSTRUCTION TIME UP TO 50%: Pre-engineered Buildings are usually delivered in just a few weeks after the approval of General arrangement drawings. Foundation and anchor bolts are casted parallel to each other while the building gets fabricated in the factory. The use of RBS Pre Engineered Building reduces the total construction time and cost of the project. This also allows faster occupancy and earlier realization of revenue.
  •   LOWER COST: Due to our designing approach, there is a significant saving in the amount of steel, manufacturing cost and site erection cost. The primary member and secondary members are transported very conveniently to reduce the transportation cost.
  •   FLEXIBILTY OF EXPANSION: Pre-engineered Buildings can be expanded in length by adding additional bays. Also expansion in width and height is possible by pre-designing for future expansion.
  •   QUALITY CONTROL: As the buildings are manufactured inside the factory, their quality is constantly monitored.
  •   LOW MAINTENANCE: Pre-engineered buildings are painted with high quality paint systems and processes such as sand blasting and shot blasting are used to make them long lasting and to provide strength to steel, roofing and the cladding sheet, they are pre-painted. Pre-painted equipments have durability and they demand minimum maintenance.
  •   ENERGY EFFICIENT ROOFING AND WALL SYSTEMS: Pre-engineered buildings are supplied with FRP (Fiber Reinforced Particle) sheet, Polycarbonate sheet, PUF panel and insulation panels to achieve the required ā€œUā€ values.
  •   ARCHITECTURAL VERSTALITY: Pre-engineered buildings have various types of fascias, canopies, and curved eaves, pre-cast concrete wall panels, curtain walls, block walls and other wall systems.
  •   SINGLE SOURCE RESPONSIBILTY: As the complete building package is supplied by a single vendor, compatibility of all the building components and accessories is assured. This is one of the major benefits of the pre-engineered building systems.


Primary framing consists of all the structural elements which transfer loads to the foundations. Main-frames consist of built-up welded primary framing members, including flange bracings, connection bolts and anchor bolts. The bases of the intermediate frames are generally pinned; however, certain circumstances may dictate the use of fixed constructions.

Protection

The primary framing components are sand / shot blasted to SA 2.5 and coated according to ISO 12944 - either primer or corrosion protection paint. For special applications, the primary framing components can be treated with hot-dipped galvanizing process.
Primer

  •   Water based primer: Red oxide Primer
  •   Nominal dry film thickness: 20-50- microns
  •   Corrosion protection: C2-high
  •   Colours: Grey (approx. RAL 7036), Red (approx. RAL 8012), Blue (approx. RAL 5010)

Corrosion protection paint

  •   Water based corrosion protection paint: acrylate-copolymere combination
  •   Nominal dry film thickness: 100 microns
  •   Corrosion protection: C3, low
  •   Colours: Grey (approx. RAL 7042), Blue (approx. RAL 5010)

Wind Bracing :

Wind bracing provides longitudinal stability for the building. It consists of cross bracing located in the roof and side walls in one or more days depending on loadings and the length of the building. When required, cross bracings can be replaced by wind portal frames or by fixed base wind columns located adjacent and connected to the main frame columns.

RBS provide Pre Engineered Building solution for secondary framing system with high quality profiling of Z and C purlin with provision of 80mm to 300mm to suite every need and to minimize the cost of the building in both C and Z purlins. We provide on line punching facility in web and Flange and even in center to meet every need as required in Pre Engineered Building.
Secondary framing consists of the elements which support the roof and wall sheeting and which transfer loads to the primary framing:

  •   Roof purlins
  •   Wall girts
  •   Sag Rod/ Sag Angle
  •   Bracing
  •   Framing of openings



Purlins and girts are galvanized Z sections, produced by cold roll forming. Which are available in diffrent materials like MS, GI, Galvalume and the Connections are made using galvanized bolts. Framings of openings essentially consist of cold-formed L, C, U or Z galvanized sections as per client need.