The document summarizes the design of a steel exhibition building with a circular plan. It describes the architectural features of the building including the dimensions of the exhibition hall and stalls. It then discusses the structural analysis conducted using STAAD Pro software and consideration of various loads. Next, it details the design of key structural elements like curved beams, trusses, bracings, columns, and base plates. Design calculations are provided for the curved beams. Finally, it provides a bill of materials and concluding remarks on the benefits of the tubular structural design.

1. B.Q.Rahman
COMPUTER AIDED STRUCTURAL ENGINEERINGCOMPUTER AIDED STRUCTURAL ENGINEERING
FINAL YEAR ‘2007-08,
IIIT-HYDERABAD
DESIGN OF STEEL EXHIBITION
BUILDING

2. Presentation outline
Architectural Features
Structural Analysis
Structural Design
Bill of Materials (quantity Estimate)
Concluding Remarks
Reference

3. Architectural Features

4. Exhibition Hall Dimensions
Dimension 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.

5. Architectural Drawings
Plan
Elevation
Grid Plan
All Drawings are done by using AUTO CAD 2007

8. Structural Analysis
Structural Analysis is done by
STAAD Pro.2006

9. Loads Considered
Dead Load
Live Load I S:875 (part 2) – 1987
Wind Load as per I S:875 part 3-1987
Seismic Load as per I S:1893 2002

10. Load combinations
o DL
o LL
o 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 +LL
o 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)

11. Member Design
Curved beams
Truss element
Bracings
Columns
Base plate

12. Design of Curved beam
The roof is supported by main curved beams
The wind load is coming on sheeting and is
transferred to the beams

13. Design Table
load case: DL+LL+WLName
Of
Curve 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

14. Design calculations
The max bending moment for curve beam is 144.07
KN-m
Allowable bearing stress σbc= 165Mpa
Section modulus required
Z(req)=B.M/ σbc= 873.15x10³ mm³
The provided section having Z(pro)= 1066.2x10³ mm³.

15. Allowable deflection ù= L/325
ù =12.77x10³ /325
ù =39mm
The 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.

16. Truss element
North light roof truss is provided
The member carry direct forces only
The property of the truss is 200mm dia & 50mm thick
Max. compressive force 1391KN.
Max. Tensile force 1124KN

17. Bracings
Horizontal 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 1377KN
Max Compressive force 462KN

18. Columns/struts
Columns are taking loads from beams, side rails &
truss member.
Length of column is 15 meters.
Column end condition: Fixed-Fixed
Struts end condition: Fixed-pinned
Max Bending Moments in column
52.1KN-m
Max Bending Moments in Strut in 45.1KN-m

19. Check for compression
Effective length: 0.65x15=9.75m
Assuming permissible compressive stress 110Mpa
Area appox:4527mm²
Tubular 500 is assumed
Slenderness ratio=60<180
From table clauses 5.5.1 αac=122Mpa
Safe load=122x8840/1000=1078KN>498KN(axial load
in the member)
Safe to carry axial load.

20. Design Base plate
The 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)=250mm
Now equating bending moment to the moment
resistance t=424mm
Base plate size 1.5x0.25x0.420

21. Bill of Materials
SL.
NO.
DESCRIPTION TOTAL WEIGHT
kG
1 500 NB Heavy Tube (columns) 591500
2
500 NB Heavy Tube (Beams)
2129600
3 200 NB Heavy Tube (Bracings) 14390
4 30mm plate (Aluminum) 678(m³)
TOTAL WEIGHT= 2735490

22. Concluding Remarks
Due to curved shape of the roof wind load on theDue to curved shape of the roof wind load on the
structure is reducedstructure is reduced..
Use of light tubular to make it cost effective andUse of light tubular to make it cost effective and
light structurelight structure
Tubular structure gives more load carrying capacityTubular structure gives more load carrying capacity
because more moment of inertiabecause more moment of inertia
Tubes make more aesthetic viewTubes make more aesthetic view
Under dynamic loading tubes have higherUnder dynamic loading tubes have higher
frequency of vibration than any other material.frequency of vibration than any other material.

23.  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-EERC
IIIT-HYDERABAD.
SPECIAL THANKS TO:
1. INSTITUTE FOR STEEL DEVELOPMENT & GROWTH
2. Arijit Guha
Coordinator (Civil Award Competition)