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Article: Equivalent stress block for normal-strength concrete incorporating strain gradient effect
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TitleEquivalent stress block for normal-strength concrete incorporating strain gradient effect
 
AuthorsPeng, J1
Ho, JCM1
Pam, HJ1
Wong, YL2
 
Issue Date2012
 
PublisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.concrete-research.com
 
CitationMagazine Of Concrete Research, 2012, v. 64 n. 1, p. 1-19 [How to Cite?]
DOI: http://dx.doi.org/10.1680/macr.2012.64.1.1
 
AbstractTo account for the different behaviours of concrete under uniaxial compression and bending in the flexural strength design of reinforced concrete (RC) members, the stress-strain curve of concrete is normally scaled down so that the adopted maximum concrete stress in flexural members is less than the uniaxial strength. However, it was found from previous experimental research that the use of a smaller maximum concrete stress would underestimate the flexural strength of RC beams and columns. To investigate the effect of strain gradient on the maximum concrete stress developed in flexure, a total of 12 plain concrete and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads separately. The maximum concrete stress developed in the eccentric specimens was determined by modifying the concrete stress-strain curve obtained from the counterpart concentric specimens based on axial force and moment equilibriums. The test results revealed that the maximum concrete stress increases with strain gradient up to a certain maximum value. A formula was developed to correlate the maximum concrete stress to strain gradient. A pair of equivalent rectangular concrete stress block parameters that incorporate the effects of strain gradient was proposed for flexural strength design of RC members. © 2012 Thomas Telford Ltd.
 
ISSN0024-9831
2012 Impact Factor: 0.563
2012 SCImago Journal Rankings: 0.658
 
DOIhttp://dx.doi.org/10.1680/macr.2012.64.1.1
 
ISI Accession Number IDWOS:000298481900001
Funding AgencyGrant Number
University of Hong Kong (HKU)10208226
Funding Information:

A research grant from the Seed Funding Programme for Basic Research (account code 10208226) of The University of Hong Kong (HKU) for the work presented here is gratefully acknowledged. The authors gratefully thank the Department of Civil and Structural Engineering of The Hong Kong Polytechnic University (PolyU), where most of the experimental tests were conducted. Support from technical staff in the structural laboratory of PolyU and HKU Department of Civil Engineering are greatly appreciated.

 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorPeng, J
 
dc.contributor.authorHo, JCM
 
dc.contributor.authorPam, HJ
 
dc.contributor.authorWong, YL
 
dc.date.accessioned2011-08-26T14:21:48Z
 
dc.date.available2011-08-26T14:21:48Z
 
dc.date.issued2012
 
dc.description.abstractTo account for the different behaviours of concrete under uniaxial compression and bending in the flexural strength design of reinforced concrete (RC) members, the stress-strain curve of concrete is normally scaled down so that the adopted maximum concrete stress in flexural members is less than the uniaxial strength. However, it was found from previous experimental research that the use of a smaller maximum concrete stress would underestimate the flexural strength of RC beams and columns. To investigate the effect of strain gradient on the maximum concrete stress developed in flexure, a total of 12 plain concrete and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads separately. The maximum concrete stress developed in the eccentric specimens was determined by modifying the concrete stress-strain curve obtained from the counterpart concentric specimens based on axial force and moment equilibriums. The test results revealed that the maximum concrete stress increases with strain gradient up to a certain maximum value. A formula was developed to correlate the maximum concrete stress to strain gradient. A pair of equivalent rectangular concrete stress block parameters that incorporate the effects of strain gradient was proposed for flexural strength design of RC members. © 2012 Thomas Telford Ltd.
 
dc.description.naturepublished_or_final_version
 
dc.identifier.citationMagazine Of Concrete Research, 2012, v. 64 n. 1, p. 1-19 [How to Cite?]
DOI: http://dx.doi.org/10.1680/macr.2012.64.1.1
 
dc.identifier.doihttp://dx.doi.org/10.1680/macr.2012.64.1.1
 
dc.identifier.eissn1751-763X
 
dc.identifier.epage19
 
dc.identifier.hkuros206054
 
dc.identifier.isiWOS:000298481900001
Funding AgencyGrant Number
University of Hong Kong (HKU)10208226
Funding Information:

A research grant from the Seed Funding Programme for Basic Research (account code 10208226) of The University of Hong Kong (HKU) for the work presented here is gratefully acknowledged. The authors gratefully thank the Department of Civil and Structural Engineering of The Hong Kong Polytechnic University (PolyU), where most of the experimental tests were conducted. Support from technical staff in the structural laboratory of PolyU and HKU Department of Civil Engineering are greatly appreciated.

 
dc.identifier.issn0024-9831
2012 Impact Factor: 0.563
2012 SCImago Journal Rankings: 0.658
 
dc.identifier.issue1
 
dc.identifier.scopuseid_2-s2.0-84858255959
 
dc.identifier.spage1
 
dc.identifier.urihttp://hdl.handle.net/10722/137254
 
dc.identifier.volume64
 
dc.languageeng
 
dc.publisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.concrete-research.com
 
dc.publisher.placeUnited Kingdom
 
dc.relation.ispartofMagazine of Concrete Research
 
dc.relation.referencesReferences in Scopus
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.titleEquivalent stress block for normal-strength concrete incorporating strain gradient effect
 
dc.typeArticle
 
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Author Affiliations
  1. The University of Hong Kong
  2. Hong Kong Polytechnic University