B.Q.RahmanCOMPUTER AIDED STRUCTURAL ENGINEERING COMPUTER AIDED STRUCTURAL ENGINEERING

FINAL YEAR ‘2007-08, IIIT-HYDERABAD

DESIGN OF STEEL EXHIBITION BUILDING

Presentation outlineArchitectural Features Structural AnalysisStructural DesignBill of Materials (quantity Estimate)Concluding RemarksReference

Architectural Features

Exhibition Hall DimensionsDimension of the plot is assumed as

Circular 120m Diameter with 15m Height

Spacing of 20m along the length of the hall

There are 19 stalls of dimensions 20mx14m.

Architectural DrawingsPlan ElevationGrid Plan

All Drawings are done by using AUTO CAD 2007

Structural Analysis

Structural Analysis is done by STAAD Pro.2006

Loads Considered Dead Load

Live Load IS:875 (part 2) – 1987

Wind Load as per IS:875 part 3-1987

Seismic Load as per IS:1893 2002

Load combinationso DLo LLo SL ( +VE X DIRECTION)o SL (-VE X DIRECTION)o SL (+VE Z DIRECTION)o SL (-VE Z DIRECTION)o WL ( +VE X DIRECTION)o WL (-VE X DIRECTION)o WL (+VE Z DIRECTION)o WL (-VE Z DIRECTION)o DL +LLo DL+WL ( FOR ALL 4 DIRECTIONS)o DL+SL ( FOR ALL 4 DIRECTIONS)o DL +LL +SL ( FOR ALL 4 DIRECTIONS)o DL +LL +WL ( FOR ALL 4 DIRECTIONS)

Member DesignCurved beamsTruss elementBracingsColumnsBase plate

Design of Curved beamThe roof is supported by main curved beamsThe wind load is coming on sheeting and is

transferred to the beams

Design Table load case: DL+LL+WLName

OfCurve beam

Maximum Axial Force

(kN)

Maximum Bending Moment(kN-m)

Section Provided

11 66.1266.12 144.07144.07

500mm dia x100mm thick

tubular section. 22 74.9174.91 158.82158.82

33 95.095.0 12.7412.74

Design calculationsThe max bending moment for curve beam is

144.07 KN-mAllowable bearing stress σbc= 165MpaSection modulus required

Z(req)=B.M/ σbc= 873.15x10³ mm³The provided section having Z(pro)=

1066.2x10³ mm³.

Allowable deflection ù= L/325 ù =12.77x10³ /325

ù =39mmThe maximum deflection obtained after

analysis = 0.44mm.The connection between the members are

made directly tube to tube with butt weld.For welding of tubular truss 4mm fillet weld

are provided.

Truss elementNorth light roof truss is providedThe member carry direct forces only The property of the truss is 200mm dia & 50mm thickMax. compressive force 1391KN.Max. Tensile force 1124KN

BracingsHorizontal bracings are provided to the truss

element.It provides stability against horizontal sway.The property of the bracing member is

200mm dia & 50mm thick.Max tensile force 1377KNMax Compressive force 462KN

Columns/strutsColumns are taking loads from beams, side

rails & truss member.Length of column is 15 meters.Column end condition: Fixed-FixedStruts end condition: Fixed-pinnedMax Bending Moments in column 52.1KN-mMax Bending Moments in Strut in 45.1KN-m

Check for compressionEffective length: 0.65x15=9.75mAssuming permissible compressive stress

110MpaArea appox:4527mm²Tubular 500 is assumed Slenderness ratio=60<180From table clauses 5.5.1 αac=122MpaSafe

load=122x8840/1000=1078KN>498KN(axial load in the member)

Safe to carry axial load.

Design Base plateThe base plate is designed considering

vertical load & moment.Taking length of base plate 1.5m(M/P)=(45x10³/736)=61mm<L/6(250mm)Width of base plate=(2xp/αxL)=250mmNow equating bending moment to the

moment resistance t=424mmBase plate size 1.5x0.25x0.420

Bill of MaterialsSL.NO.

DESCRIPTION TOTAL WEIGHT kG

1 500 NB Heavy Tube (columns) 591500

2500 NB Heavy Tube (Beams)

2129600

3 200 NB Heavy Tube (Bracings) 14390

4 30mm plate (Aluminum) 678(m³)

TOTAL WEIGHT= 2735490

Concluding RemarksDue to curved shape of the roof wind load on Due to curved shape of the roof wind load on the structure is reducedthe structure is reduced..

Use of light tubular to make it cost effective Use of light tubular to make it cost effective and light structureand light structure

Tubular structure gives more load carrying Tubular structure gives more load carrying capacity because more moment of inertiacapacity because more moment of inertia

Tubes make more aesthetic viewTubes make more aesthetic viewUnder dynamic loading tubes have higher Under dynamic loading tubes have higher

frequency of vibration than any other frequency of vibration than any other material.material.

Due to accident on Nov 2nd . I couldn't participated in these prestigious competition. So kindly accept the PPT slides on behalf of my absent.

GUIDED BY:PROFF. Pradeep Kumar Ramancharala

H.O.D-EERCIIIT-HYDERABAD.

SPECIAL THANKS TO:1. INSTITUTE FOR STEEL DEVELOPMENT & GROWTH2. Arijit Guha

Coordinator (Civil Award Competition)