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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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Slide provided by NCK
Slide provided by NCK
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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