design of steel structure
DESCRIPTION
CIVIL ENGINEERRINGTRANSCRIPT
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B.Q.RahmanCOMPUTER AIDED STRUCTURAL ENGINEERING COMPUTER AIDED STRUCTURAL ENGINEERING
FINAL YEAR ‘2007-08, IIIT-HYDERABAD
DESIGN OF STEEL EXHIBITION BUILDING
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Presentation outlineArchitectural Features Structural AnalysisStructural DesignBill of Materials (quantity Estimate)Concluding RemarksReference
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Architectural Features
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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.
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Architectural DrawingsPlan ElevationGrid Plan
All Drawings are done by using AUTO CAD 2007
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Structural Analysis
Structural Analysis is done by STAAD Pro.2006
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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
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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)
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Member DesignCurved beamsTruss elementBracingsColumnsBase plate
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Design of Curved beamThe roof is supported by main curved beamsThe wind load is coming on sheeting and is
transferred to the beams
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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
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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.
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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.
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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
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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
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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
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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.
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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
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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
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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.
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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)