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Article: Estimation of shrinkage effects on reinforced concrete podiums

TitleEstimation of shrinkage effects on reinforced concrete podiums
Authors
KeywordsConcrete
Crack control
Creep
Late-cast strip
Podium structure
Shrinkage
Stage construction
Issue Date2006
PublisherHong Kong Institution of Engineers. The Journal's web site is located at http://www.hkie.org.hk/html/publications/transactions/index.asp
Citation
Transactions Hong Kong Institution Of Engineers, 2006, v. 13 n. 4, p. 33-42 How to Cite?
AbstractThe shrinkage of concrete often creates cracking problems in large podium structures. The long-term effects of shrinkage and creep in a concrete structure may be estimated by analysing it as a plane stress problem with the supporting walls and columns modelled as springs having suitable stiffnesses. The variation of stresses and strains may be obtained by time integration based on the conventional creep coefficient, time-dependent concrete modulus and shrinkage strain. Using a simplified one-dimensional model, the effects of structure size, support stiffness and stage construction on the induced stresses are investigated. Results show that the magnitude of induced stress normally increases with the member length and support stiffness. The rate of stress increase also depends on the support stiffness. An extensive parametric study is carried out to investigate the use of stage construction in controlling shrinkage stresses particularly focusing on the effect of time-lag and size of late-cast strip. Design charts are prepared for estimation of shrinkage stresses for simple cases. Examples of rough estimation of shrinkage stresses in two-dimensional cases are presented. Recommendations are also given for provision of reinforcement for crack control.
Persistent Identifierhttp://hdl.handle.net/10722/70991
ISSN
2015 SCImago Journal Rankings: 0.145
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, CHen_HK
dc.contributor.authorLee, PKKen_HK
dc.contributor.authorAu, FTKen_HK
dc.date.accessioned2010-09-06T06:27:56Z-
dc.date.available2010-09-06T06:27:56Z-
dc.date.issued2006en_HK
dc.identifier.citationTransactions Hong Kong Institution Of Engineers, 2006, v. 13 n. 4, p. 33-42en_HK
dc.identifier.issn1023-697Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/70991-
dc.description.abstractThe shrinkage of concrete often creates cracking problems in large podium structures. The long-term effects of shrinkage and creep in a concrete structure may be estimated by analysing it as a plane stress problem with the supporting walls and columns modelled as springs having suitable stiffnesses. The variation of stresses and strains may be obtained by time integration based on the conventional creep coefficient, time-dependent concrete modulus and shrinkage strain. Using a simplified one-dimensional model, the effects of structure size, support stiffness and stage construction on the induced stresses are investigated. Results show that the magnitude of induced stress normally increases with the member length and support stiffness. The rate of stress increase also depends on the support stiffness. An extensive parametric study is carried out to investigate the use of stage construction in controlling shrinkage stresses particularly focusing on the effect of time-lag and size of late-cast strip. Design charts are prepared for estimation of shrinkage stresses for simple cases. Examples of rough estimation of shrinkage stresses in two-dimensional cases are presented. Recommendations are also given for provision of reinforcement for crack control.en_HK
dc.languageengen_HK
dc.publisherHong Kong Institution of Engineers. The Journal's web site is located at http://www.hkie.org.hk/html/publications/transactions/index.aspen_HK
dc.relation.ispartofTransactions Hong Kong Institution of Engineersen_HK
dc.subjectConcreteen_HK
dc.subjectCrack controlen_HK
dc.subjectCreepen_HK
dc.subjectLate-cast stripen_HK
dc.subjectPodium structureen_HK
dc.subjectShrinkageen_HK
dc.subjectStage constructionen_HK
dc.titleEstimation of shrinkage effects on reinforced concrete podiumsen_HK
dc.typeArticleen_HK
dc.identifier.emailLee, PKK:hreclkk@hkucc.hku.hken_HK
dc.identifier.emailAu, FTK:francis.au@hku.hken_HK
dc.identifier.authorityLee, PKK=rp00141en_HK
dc.identifier.authorityAu, FTK=rp00083en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-33846699542en_HK
dc.identifier.hkuros132115en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33846699542&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume13en_HK
dc.identifier.issue4en_HK
dc.identifier.spage33en_HK
dc.identifier.epage42en_HK
dc.publisher.placeHong Kongen_HK
dc.identifier.scopusauthoridLee, PKK=24522826500en_HK
dc.identifier.scopusauthoridAu, FTK=7005204072en_HK

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