PRE ENGINEERED STEEL BUILDINGS

BY

manohar reddy

sreenivasa rao

Narendra kumar

Kiran babu

Phanindra

Ra jeev and soundarya

amara institute of engg and tech

CONCEPT, DESIGN & CONSTRUCTION

PRE ENGINEERED STEEL BUILDINGS

PRE ENGINEERED BUILDINGSPRE ENGINEERED BUILDINGS

The buildings are design as per 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.

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.

BRIEF HISTORYBRIEF HISTORY

APPLICATIONS

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…

Industrial Building

Parking lotsParking lots

Indoor StadiumsIndoor Stadiums

Railway StationRailway Station

Aircraft Hangars Metro StationMetro Station

Wear HouseWear House High Rise BuildingHigh Rise Building

ADVANTAGES

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

Self weight 30% lighter Primary Member is tapered

section Secondary members are light

weight rolled framed “Z” and “C” section

Self weight More heavy Primary members are Hot

rolled “I” section Secondary members are “I”

or “C” section which are heavy in weight.

Delivery – average 6 to 8 weeks

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

Erection cost and time- accurately known

Erection process is easy, fast, step by step

Delivery- average 20 to 26 weeks

Foundation- expensive, heavy foundation required.

Erection cost and time- 20% more than PEB

Erection process is slow and extensive field labor is required.

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

Overall price -30%lower architecture-achieved at low

cast

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

Overall price - Higher Price per square meter.

Architecture- achieved at higher cost

COMPONENTS

MAIN FRAME PRIMARY MEMBERS (Main Frame)

ColumnsRafters

SECONDARY MEMBERSPurlinsGirts

SHEETINGSHEETING RoofRoof WallWall Fascias etcFascias etc

AccessoriesAccessories VentilatorsVentilators Sky LightsSky Lights Misc.Misc.

OTHER MAJOR COMPONENTS OF PEB

CRANE BRACKETS & BEAMS

MEZZANINE FLOORS

STRUCTURAL PARTIONS

FASCIAS CANOPIES

Load 1X

Y

Z

PRE-ENGINEERED BUILDINGS NOMENCLATURE – STANDARD FRAMING SYSTEMS

TCCS = TAPERED COLUMN CLEAR SPAN

Load 1X

Y

Z

TCMS-1 TAPERED COLUMN MULTI-SPAN WITH 1 INTERMEDIATE COLUMN.

Load 1X

Y

ZSSCS = SINGLE SLOPE CLEAR SPAN.

Load 1X

Y

Z

SSMS-1= SINGLE SLOPE MULTI-SPAN WITH 1 INTERMEDIATE COLUMN

GUIDELINES FOR PEB DESIGN AT PROPOSAL STAGE

All Designs Shall Be As Per MBMA [Metal Building Manufacturer Association] &Client Specifies As Per Is Code.

Live load as Per American Code = 0.57 KN/M2 and as Per IS Code = 0.75 KN/M2. (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

design codes generally used:

AISC : American institute of steel construction manual

AISI : American iron and steel institute specifications

MBMA : Metal building manufacturer’s code

ANSI : American national standards institute specifications

ASCE : American society of civil engineers

UBC : Uniform building code

IS: Indian standards

Equivalent to Indian standard

IS 800: For design of structural steel

IS 800-2007: For design of structural steel by LSM

IS 801: For design of cold formed section

IS 875: For calculation of load

STRUCTURAL DESIGN PROCESS LOOP

OPTIMAL STRUCTURAL DESIGN

ANALYSIS :-1.Dead load calculations2.Live load calculations3.Wind load calculations

LOAD COMBINATIONS :-A. 1.5(DL + LL)B. 1.5(DL + WL)

PLOT THE MAXIMUM SFD AND BMD OF THE MEMBERS :-DESIGNING :-

1.Design of the primary members2.Design of connection plate3.Purline Design4.Girt Design5.Base Plate6.Anchor Bolt design for Moment Condition7.Anchor Bolt design for Shear Condition8.Cranes Design

DESIGN STEPS

Optimisation of frame

Basic Frame• Width of the frame = 16 M• Height of the frame = 8 M• Length of the frame = 35 M• Wind speed V = 43 M/S• Bay spacing L = 7 M• Slop of roof I= 1:10• Seismic zone = 4

LOAD COMBINATION:- 1.5(DL + LL)

LOAD COMBINATION:- 1.5(DL + LL)

1 2

3 4

LOAD COMBINATION:- 1.5(DL + WL)

LOAD COMBINATION:- 1.5(DL + WL)

1222

43

DESIGN RESULT : BY LIMIT STATE METHOD

DESIGN RESULT: BY WORKING STATE METHOD

•USING SAME SECTION THAT USED IN LIMIT STATE METHOD

DESIGN RESULT : BY WORKING STATE METHOD

ERECTION SYSTEM

Understanding The Engineering Documents.1. Anchor Bolt Setting Plan2. Cross section3. Roof framing plan4. Roof sheeting & framing5. Sidewall sheeting & framing6. Other drawings7. Bill of materials

Preparation for Erection1. Pre Erection checks2. Receiving Materials at site3. Unloading Containers

Erection of the Framing1. Preparation of the First Bay2. Main frames3. Mezzanine floors4. Crane Beams

Sheeting & Trimming

Sheeting preparation Sheeting the walls Sheeting the roofs Miscellaneous trimmings Fascia