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Article: Maximum concrete stress developed in unconfined flexural RC members
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TitleMaximum concrete stress developed in unconfined flexural RC members
 
AuthorsHo, JCM1
Pam, HJ1
Peng, J1
Wong, YL2
 
KeywordsRectangular Stress Block Parameters
Reinforced Concrete
Strain Gradient
Uni-Axial Concrete Stress
 
Issue Date2011
 
PublisherTechno-Press. The Journal's web site is located at http://technopress.kaist.ac.kr/?journal=cac&subpage=6
 
CitationComputers And Concrete, 2011, v. 8 n. 2, p. 207-227 [How to Cite?]
 
AbstractIn flexural strength design of unconfined reinforced concrete (RC) members, the concrete compressive stress-strain curve is scaled down from the uni-axial stress-strain curve such that the maximum concrete stress adopted in design is less than the uni-axial strength to account for the strain gradient effect. It has been found that the use of this smaller maximum concrete stress will underestimate the flexural strength of unconfined RC members although the safety factors for materials are taken as unity. Herein, in order to investigate the effect of strain gradient on the maximum concrete stress that can be developed in unconfined flexural RC members, several pairs of plain concrete (PC) and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads. From the test results, the maximum concrete stress developed in the eccentric specimens under strain gradient is determined by the modified concrete stress-strain curve obtained from the counterpart concentric specimens based on axial load and moment equilibriums. Based on that, a pair of equivalent rectangular concrete stress block parameters for the purpose of flexural strength design of unconfined RC members is determined.
 
ISSN1598-8198
2012 Impact Factor: 0.936
2012 SCImago Journal Rankings: 0.471
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorHo, JCM
 
dc.contributor.authorPam, HJ
 
dc.contributor.authorPeng, J
 
dc.contributor.authorWong, YL
 
dc.date.accessioned2012-06-26T06:06:13Z
 
dc.date.available2012-06-26T06:06:13Z
 
dc.date.issued2011
 
dc.description.abstractIn flexural strength design of unconfined reinforced concrete (RC) members, the concrete compressive stress-strain curve is scaled down from the uni-axial stress-strain curve such that the maximum concrete stress adopted in design is less than the uni-axial strength to account for the strain gradient effect. It has been found that the use of this smaller maximum concrete stress will underestimate the flexural strength of unconfined RC members although the safety factors for materials are taken as unity. Herein, in order to investigate the effect of strain gradient on the maximum concrete stress that can be developed in unconfined flexural RC members, several pairs of plain concrete (PC) and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads. From the test results, the maximum concrete stress developed in the eccentric specimens under strain gradient is determined by the modified concrete stress-strain curve obtained from the counterpart concentric specimens based on axial load and moment equilibriums. Based on that, a pair of equivalent rectangular concrete stress block parameters for the purpose of flexural strength design of unconfined RC members is determined.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationComputers And Concrete, 2011, v. 8 n. 2, p. 207-227 [How to Cite?]
 
dc.identifier.epage227
 
dc.identifier.issn1598-8198
2012 Impact Factor: 0.936
2012 SCImago Journal Rankings: 0.471
 
dc.identifier.issue2
 
dc.identifier.scopuseid_2-s2.0-80955140488
 
dc.identifier.spage207
 
dc.identifier.urihttp://hdl.handle.net/10722/150624
 
dc.identifier.volume8
 
dc.languageeng
 
dc.publisherTechno-Press. The Journal's web site is located at http://technopress.kaist.ac.kr/?journal=cac&subpage=6
 
dc.publisher.placeKorea, Republic of
 
dc.relation.ispartofComputers and Concrete
 
dc.relation.referencesReferences in Scopus
 
dc.subjectRectangular Stress Block Parameters
 
dc.subjectReinforced Concrete
 
dc.subjectStrain Gradient
 
dc.subjectUni-Axial Concrete Stress
 
dc.titleMaximum concrete stress developed in unconfined flexural RC members
 
dc.typeArticle
 
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<contributor.author>Peng, J</contributor.author>
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<description.abstract>In flexural strength design of unconfined reinforced concrete (RC) members, the concrete compressive stress-strain curve is scaled down from the uni-axial stress-strain curve such that the maximum concrete stress adopted in design is less than the uni-axial strength to account for the strain gradient effect. It has been found that the use of this smaller maximum concrete stress will underestimate the flexural strength of unconfined RC members although the safety factors for materials are taken as unity. Herein, in order to investigate the effect of strain gradient on the maximum concrete stress that can be developed in unconfined flexural RC members, several pairs of plain concrete (PC) and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads. From the test results, the maximum concrete stress developed in the eccentric specimens under strain gradient is determined by the modified concrete stress-strain curve obtained from the counterpart concentric specimens based on axial load and moment equilibriums. Based on that, a pair of equivalent rectangular concrete stress block parameters for the purpose of flexural strength design of unconfined RC members is determined.</description.abstract>
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Author Affiliations
  1. The University of Hong Kong
  2. Hong Kong Polytechnic University