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Article: Theoretical study on effect of confinement on flexural ductility of normal and high-strength concrete beams

TitleTheoretical study on effect of confinement on flexural ductility of normal and high-strength concrete beams
Authors
Issue Date2004
PublisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.concrete-research.com
Citation
Magazine of Concrete Research, 2004, v. 56 n. 5, p. 299-309 How to Cite?
AbstractCompared with normal concrete, high-strength concrete has higher strength but is generally more brittle. Its use in a reinforced concrete structure, if not properly controlled, could lead to an unsustainable reduction in ductility. However, confinement could be provided to improve the ductility of the structure. In this study, the effects of concrete strength and confinement on the flexural ductility of reinforced concrete beams have been evaluated by means of complete moment-curvature analysis of beam sections cast in different concretes and provided with different confinements. The results reveal that the use of high-strength concrete at a constant tension steel ratio would increase the flexural ductility, but at a constant tension to balanced steel ratio would decrease the flexural ductility. In contrast, the provision of confinement would always increase the flexural ductility. It does this in two ways: first, it increases the balanced steel ratio so that, at the same tension steel ratio, the tension to balanced steel ratio is decreased; and second, it increases the residual strength and ductility of the concrete so that, at the same tension to balanced steel ratio, the flexural ductility of the beam section is increased.
Persistent Identifierhttp://hdl.handle.net/10722/150341
ISSN
2015 Impact Factor: 1.227
2015 SCImago Journal Rankings: 0.955
References

 

DC FieldValueLanguage
dc.contributor.authorKwan, AKHen_US
dc.contributor.authorAu, FTKen_US
dc.contributor.authorChau, SLen_US
dc.date.accessioned2012-06-26T06:03:33Z-
dc.date.available2012-06-26T06:03:33Z-
dc.date.issued2004en_US
dc.identifier.citationMagazine of Concrete Research, 2004, v. 56 n. 5, p. 299-309en_US
dc.identifier.issn0024-9831en_US
dc.identifier.urihttp://hdl.handle.net/10722/150341-
dc.description.abstractCompared with normal concrete, high-strength concrete has higher strength but is generally more brittle. Its use in a reinforced concrete structure, if not properly controlled, could lead to an unsustainable reduction in ductility. However, confinement could be provided to improve the ductility of the structure. In this study, the effects of concrete strength and confinement on the flexural ductility of reinforced concrete beams have been evaluated by means of complete moment-curvature analysis of beam sections cast in different concretes and provided with different confinements. The results reveal that the use of high-strength concrete at a constant tension steel ratio would increase the flexural ductility, but at a constant tension to balanced steel ratio would decrease the flexural ductility. In contrast, the provision of confinement would always increase the flexural ductility. It does this in two ways: first, it increases the balanced steel ratio so that, at the same tension steel ratio, the tension to balanced steel ratio is decreased; and second, it increases the residual strength and ductility of the concrete so that, at the same tension to balanced steel ratio, the flexural ductility of the beam section is increased.en_US
dc.languageengen_US
dc.publisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.concrete-research.comen_US
dc.relation.ispartofMagazine of Concrete Researchen_US
dc.rightsMagazine of Concrete Research. Copyright © Thomas Telford Ltd.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsPermission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees-
dc.titleTheoretical study on effect of confinement on flexural ductility of normal and high-strength concrete beamsen_US
dc.typeArticleen_US
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-9831&volume=56&issue=5&spage=299&epage=309&date=2004&atitle=Theoretical+study+on+effect+of+confinement+on+flexural+ductility+of+reinforced+normal+and+high-strength+concrete+beams-
dc.identifier.emailKwan, AKH: khkwan@hkucc.hku.hken_US
dc.identifier.emailAu, FTK: francis.au@hku.hken_US
dc.identifier.authorityKwan, AKH=rp00127en_US
dc.identifier.authorityAu, FTK=rp00083en_US
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1680/macr.56.5.299.36313en_US
dc.identifier.scopuseid_2-s2.0-3142552693en_US
dc.identifier.hkuros94844-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-3142552693&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume56en_US
dc.identifier.issue5en_US
dc.identifier.spage299en_US
dc.identifier.epage309en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridKwan, AKH=7101738204en_US
dc.identifier.scopusauthoridAu, FTK=7005204072en_US
dc.identifier.scopusauthoridChau, SL=7005551028en_US

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