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Article: Strain gradient effects on flexural strength design of normal-strength concrete columns

TitleStrain gradient effects on flexural strength design of normal-strength concrete columns
Authors
KeywordsColumns
Concrete stress block
Design
Flexural strength
Normal-strength concrete
Reinforced concrete
Strain gradient
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/engstruct
Citation
Engineering Structures, 2011, v. 33 n. 1, p. 18-31 How to Cite?
AbstractThe equivalent rectangular concrete stress block has commonly been adopted for the flexural strength design of reinforced concrete (RC) members for decades. In this stress block, the equivalent concrete stress is expressed as αfc' (fc' is the uni-axial concrete cylinder strength). Currently, the value of α adopted in various RC design codes is only concrete-strength dependent and equal to 0.85 for NSC. However, in an experimental study conducted previously by the authors on NSC columns subjected to concentric and eccentric axial loads, it was found that α increases significantly as the strain gradient increases. Therefore, the effect of the strain gradient should not be neglected. In this paper, a review on the previous test results on NSC columns is presented and a strain-gradient dependent equivalent rectangular concrete stress block is developed. Based on this proposed stress block, a new flexural strength design method for NSC columns that incorporates the effects of the strain gradient is proposed. A series of column interaction diagrams with various concrete strengths and steel ratios are derived for design purposes. Lastly, these interaction diagrams are compared with the existing column design charts provided in various RC design codes to verify their applicability. © 2010 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/137257
ISSN
2015 Impact Factor: 1.893
2015 SCImago Journal Rankings: 1.813
ISI Accession Number ID
Funding AgencyGrant Number
University of Hong Kong (HKU)200802159007
Funding Information:

The research grant from the Seed Funding Programme for Basic Research (Project Code 200802159007) of The University of Hong Kong (HKU) for the work presented herein is gratefully acknowledged. The authors gratefully thank the Department of Civil and Structural Engineering, Hong Kong Polytechnic University (PolyU), where most of the experimental tests were conducted. Also, the support of the technical staff in the structural laboratory of PolyU and the Department of Civil Engineering, HKU, are greatly appreciated.

References

 

DC FieldValueLanguage
dc.contributor.authorHo, JCMen_HK
dc.contributor.authorPeng, Jen_HK
dc.date.accessioned2011-08-26T14:21:49Z-
dc.date.available2011-08-26T14:21:49Z-
dc.date.issued2011en_HK
dc.identifier.citationEngineering Structures, 2011, v. 33 n. 1, p. 18-31en_HK
dc.identifier.issn0141-0296en_HK
dc.identifier.urihttp://hdl.handle.net/10722/137257-
dc.description.abstractThe equivalent rectangular concrete stress block has commonly been adopted for the flexural strength design of reinforced concrete (RC) members for decades. In this stress block, the equivalent concrete stress is expressed as αfc' (fc' is the uni-axial concrete cylinder strength). Currently, the value of α adopted in various RC design codes is only concrete-strength dependent and equal to 0.85 for NSC. However, in an experimental study conducted previously by the authors on NSC columns subjected to concentric and eccentric axial loads, it was found that α increases significantly as the strain gradient increases. Therefore, the effect of the strain gradient should not be neglected. In this paper, a review on the previous test results on NSC columns is presented and a strain-gradient dependent equivalent rectangular concrete stress block is developed. Based on this proposed stress block, a new flexural strength design method for NSC columns that incorporates the effects of the strain gradient is proposed. A series of column interaction diagrams with various concrete strengths and steel ratios are derived for design purposes. Lastly, these interaction diagrams are compared with the existing column design charts provided in various RC design codes to verify their applicability. © 2010 Elsevier Ltd.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/engstructen_HK
dc.relation.ispartofEngineering Structuresen_HK
dc.subjectColumnsen_HK
dc.subjectConcrete stress blocken_HK
dc.subjectDesignen_HK
dc.subjectFlexural strengthen_HK
dc.subjectNormal-strength concreteen_HK
dc.subjectReinforced concreteen_HK
dc.subjectStrain gradienten_HK
dc.titleStrain gradient effects on flexural strength design of normal-strength concrete columnsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0141-0296&volume=33&issue=1&spage=18&epage=31&date=2011&atitle=Strain+gradient+effects+on+flexural+strength+design+of+normal-strength+concrete+columns-
dc.identifier.emailHo, JCM:johnny.ho@hku.hken_HK
dc.identifier.authorityHo, JCM=rp00070en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.engstruct.2010.09.014en_HK
dc.identifier.scopuseid_2-s2.0-78649446169en_HK
dc.identifier.hkuros191312en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78649446169&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume33en_HK
dc.identifier.issue1en_HK
dc.identifier.spage18en_HK
dc.identifier.epage31en_HK
dc.identifier.eissn1873-7323-
dc.identifier.isiWOS:000285905100003-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridHo, JCM=24831880500en_HK
dc.identifier.scopusauthoridPeng, J=35335169300en_HK
dc.identifier.citeulike8069023-

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