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Article: Equivalent stress block for normal-strength concrete incorporating strain gradient effect

TitleEquivalent stress block for normal-strength concrete incorporating strain gradient effect
Authors
Issue Date2012
PublisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.concrete-research.com
Citation
Magazine Of Concrete Research, 2012, v. 64 n. 1, p. 1-19 How to Cite?
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.
Persistent Identifierhttp://hdl.handle.net/10722/137254
ISSN
2014 Impact Factor: 0.912
2014 SCImago Journal Rankings: 0.896
ISI Accession Number ID
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.

References

 

DC FieldValueLanguage
dc.contributor.authorPeng, Jen_HK
dc.contributor.authorHo, JCMen_HK
dc.contributor.authorPam, HJen_HK
dc.contributor.authorWong, YLen_HK
dc.date.accessioned2011-08-26T14:21:48Z-
dc.date.available2011-08-26T14:21:48Z-
dc.date.issued2012en_HK
dc.identifier.citationMagazine Of Concrete Research, 2012, v. 64 n. 1, p. 1-19en_HK
dc.identifier.issn0024-9831en_HK
dc.identifier.urihttp://hdl.handle.net/10722/137254-
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.en_HK
dc.languageengen_US
dc.publisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.concrete-research.comen_HK
dc.relation.ispartofMagazine of Concrete Researchen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleEquivalent stress block for normal-strength concrete incorporating strain gradient effecten_HK
dc.typeArticleen_HK
dc.identifier.emailHo, JCM:johnny.ho@hku.hk Pam, HJ: pamhoatj@hku.hken_HK
dc.identifier.authorityHo, JCM=rp00070 Pam, HJ=rp00071en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1680/macr.2012.64.1.1en_HK
dc.identifier.scopuseid_2-s2.0-84858255959en_HK
dc.identifier.hkuros206054-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84858255959&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume64en_HK
dc.identifier.issue1en_HK
dc.identifier.spage1en_HK
dc.identifier.epage19en_HK
dc.identifier.eissn1751-763X-
dc.identifier.isiWOS:000298481900001-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridPeng, J=35335169300en_HK
dc.identifier.scopusauthoridHo, JCM=24831880500en_HK
dc.identifier.scopusauthoridPam, HJ=55086308600en_HK
dc.identifier.scopusauthoridWong, YL=7403041495en_HK

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