7a Steel Projects(Presentation1)

8/13/2019 7a Steel Projects(Presentation1)

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ecial Presentation I: Steel Projects 18/0

R Liew

Structural Steelwork in SingaporeStructural Steelwork in Singapore

and Case Studiesand Case Studies

Prof. J Y Richard LiewProf. J Y Richard Liew

Department of Civil EngineeringDepartment of Civil Engineering

National University of SingaporeNational University of Singapore

over MRT Stationover MRT Station


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Cantilever Structure


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Stability During Construction


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Suntec City


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Brunei Hangar


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Bracing detail single sided, single bolt stability brace


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Effect of Lateral Buckling of BeamsEffect of Lateral Buckling of Beams


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CASE STUDY 1

COMPASSVALE SCHOOL HALL

SSTRUCTURALTRUCTURAL SSYSTEMYSTEM


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SSTRUCTURALTRUCTURAL SSYSTEMYSTEM

SSITEITE OOBSERVATIONBSERVATION

BeforeAfter


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SSITEITE OOBSERVATIONBSERVATION

Did not consider interaction

DDESIGNESIGN EERRORSRRORSColumn DesignColumn Design

of truss with column

Excessive flexibility andinadequate strength to resisthorizontal force

Additional moment due tohorizontal force


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IncorrectIncorrect

Truss SupportTruss Support

detail fordetail for

rollerroller

supportsupport

Actual Details

Detail forDetail for RROLLEROLLER SupportSupport


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CASE STUDY 2

ROOF TRUSS IN TUAS

EELEVATION OFLEVATION OF RROOFOOFTTRUSSRUSS

60m


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EERECTION OFRECTION OF RROOFOOFTTRUSSRUSS

EERECTION OFRECTION OF RROOFOOFTTRUSSRUSS


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CCOLLAPSE OFOLLAPSE OF RROOFOOFTTRUSSRUSSPurlinsPurlins

Concrete structure

not completed

Concrete structure not completedConcrete structure not completed


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CCOLLAPSE OFOLLAPSE OF RROOFOOFTTRUSSRUSS

CCOLLAPSE OFOLLAPSE OF RROOFOOFTTRUSSRUSS


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No diagonal bracings for lateral

CCAUSE OFAUSE OF CCOLLAPSEOLLAPSE

stability

Missing tie beams because concretestructure was not completed during steelerection

Accidental lateral loads

Stability of Steel truss during erection. Erection of first two trusses

Column

Tie beamGuy


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N

Lateral Stability of Steel Truss

N

N

Top chord

N

Stability of Steel truss during erection. Erection of first two trusses

Column

Tie beamGuy


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Design issues related to constructionInstallation of vertical bracing, wind bracing and purlins

Construction Sequence3. Erection of subsequent trusses


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1 Lack of anchoring of lateral ties

2 Lack of end restraintsSlide provided by NCK


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Lateral buckling of compression chord

Slide provided by NCK

Adequate Bracing duringConstruction

6

Sequence of erection

1

1

2

3

4

5


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Case study 6 Collapse of BusCase study 6 Collapse of Bus

ShelterShelter


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Direct butt welding Inner tube stiffening External stiffening


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Think outside the Box!Other technologies

SustainabilityEngineering history

Documents

7a Steel Projects(Presentation1)