NATIONAL COMPETITIONNATIONAL COMPETITION ’07-08’07-08

FOR CIVIL & STRUCTURAL ENGINEERING STUDENTSFOR CIVIL & STRUCTURAL ENGINEERING STUDENTSON BEST INNOVATIVE STRUCTURAL STEEL DESIGNON BEST INNOVATIVE STRUCTURAL STEEL DESIGNORGANISED BY: INSDAGORGANISED BY: INSDAG

DESIGN OF STEEL EXHIBITION BUILDING

B.Q.RahmanCOMPUTER AIDED STRUCTURAL ENGINEERING COMPUTER AIDED STRUCTURAL ENGINEERING FINAL YEAR ‘2007-08, IIIT-HYDERABAD

Presentation outline

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

Architectural Features

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.

Architectural Drawings

Plan 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 Design

Curved beams Truss element Bracings Columns Base plate

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

Design Table load case: DL+LL+WL

NameOf

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

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.

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.

Truss element

North 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

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

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

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.

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

Bill of Materials

SL.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 Due to curved shape of the roof wind load on the structure is reducedon the structure is reduced..

Use of light tubular to make it cost Use of light tubular to make it cost effective and light structureeffective and 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 view Under 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)