Pre Engineered Buildings of Steel Trusses

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Contents

Concept, Design & Construction of Pre Engineered Steel Buildings

Pre Engineered Buildings

  • Tailor made building based on client’s requirement & actual design calculations using tapered sections.
  • A combination of built up section, hot rolled section, cold formed elements and profiled sheets
  • Designing and casting is done in factory
  • Building components are brought to site
  • Then fixed/jointed at the site
  • All connections are bolted.

History

  • Steel was very expensive item in USA
  • The concept of PEB originate from here.
  • The idea was that section should be provided as per B.M.D.
  • This lead to the saving in steel and development of PEB concept.

Applications of Pre-Engineered Steel Buildings

  • Industrial Buildings
  • Warehouses
  • Commercial Complexes
  • Showrooms
  • Offices
  • Schools
  • Indoor Stadiums
  • Outdoor Stadiums with canopies
  • Gas Stations
  • Metro Stations, Bus Terminals, Parking Lots
  • Primary Health Centers, Angan wadi’s and many more...

Advantages

  • Aesthetic Appeal
  • Faster Completion
  • Economical
  • Seismic Resistance
  • Ease of Expansion
  • Maintenance Free
  • Large Clear Spans
  • Controlled Quality
  • Hassle Free
  • Comparison



  1. Self weight

  2. 30% lighter

  3. Primary Member is tapered section

  4. Secondary members are light weight rolled framed “Z” and “C” section

  5. Delivery – average 6 to 8 weeks

  6. Foundation-simple design, easy to construct & light wt.

  7. Erection cost and time- accurately known

  8. Erection process is easy, fast, step by step

  9. Seismic Resistance- low weight flexible frames offer higher resistance to seismic forces

  10. Overall price -30%lower

  11. architecture-achieved at low cast

  1. Self weight

  2. More heavy

  3. Primary members are Hot rolled “I” section

  4. Secondary members are “I” or “C” section which are heavy in weight.

  5. Delivery- average 20 to 26 weeks

  6. Foundation- expensive, heavy foundation required.

  7. Erection cost and time- 20% more than PEB

  8. Erection process is slow and extensive field labor is required.

  9. Seismic Resistance- rigid heavy weight structures do not perform well in seismic zones

  10. Overall price - Higher Price per square meter.

  11. Architecture- achieved at higher cost

Components of Pre Engineered Metal Buildings

  • Main Frame

  • Primary Members

  • Columns

  • Rafters

  • Secondary Members

  • Purlins

  • Girts

  • Sheeting

  • Roof

  • Wall

  • Fascias etc

  • Accessories

  • Ventilators

  • Sky Lights

  • Misc.


Design Issues

  • Structural planning
  • Frame configurations
  • Types of loads & assessment
  • End conditions
  • Cranes
  • Mezzanines
  • Load combinations

Guidelines for peb design at proposal stage

  • All designs shall be as per mbma American standards unless client specifies as per is code
  • Live load as per American code = 0.57 kn/m^2 and as per is code = 0.75 kn/m^2. (reduction in live load to be incorporated for buildings having higher slopes)
  • As per American code :horizontal deflection = l /180 & vertical deflection=eh/100 for main frames.
  • Wind terrain category 3 is to be selected unless more data is available.
  • In American design , wind coefficients to be followed as given in mbma.
  • In is design, internal & external building wind coefficients as per is -875 (part-3).
  • Generally buildings are to be designed as pinned except for building span >30m or crane capacity of more than 5 tons or height greater than 9 m
  • Standard purlin laps should be 385 mm

Steps of Design

  1. . Wind load calculation
  2. . Purlin Design
  3. .Girt Design
  4. .Design of Main Frame
  5. .Base Plate
  6. .Anchor Bolt design for Moment Condition
  7. .Anchor Bolt design for Shear Condition
  8. .Gable column design
  9. .Design of connection plate
  10. .Cranes Design

Erection System

  1. Understanding the engineering documents.
  • Anchor Bolt Setting Plan
  • Cross section
  • Roof framing plan
  • Roof sheeting & framing
  • Sidewall sheeting & framing
  • Other drawings
  • Bill of materials
  1. Preparation for Erection
  • Pre Erection checks
  • Receiving Materials at site
  • Unloading Containers
  1. Erection of the Framing
  • Preparation of the First Bay
  • Main frames
  • Mezzanine floors
  • Crane Beams
  1. Sheeting & Trimming
  • Sheeting preparation
  • Sheeting the walls
  • Sheeting the roofs
  • Miscellaneous trimmings
  • Fascia

Related Pages

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