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Article: Strain gradient effects on concrete stress-strain curve

TitleStrain gradient effects on concrete stress-strain curve
Authors
KeywordsColumns
Concrete structures
Design methods & aids
Issue Date2012
PublisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.icevirtuallibrary.com/content/serial/stbu
Citation
Proceedings of the Institution of Civil Engineers: Structures and Buildings, 2012, v. 165 n. 10, p. 543-565 How to Cite?
AbstractThe stress–strain characteristic of concrete developed in flexure is one of the essential parameters for the ultimate flexural strength design of reinforced concrete (RC) members. Currently, the stress–strain curve of concrete developed in flexure is obtained by scaling down the uniaxial stress–strain curve. In current RC design codes, it is represented by an equivalent rectangular concrete stress block depending solely on the concrete strength. By comparing the theoretical strength evaluated for the stress block with the measured strength, the authors found that current codes underestimate the actual flexural strength of RC beams and columns by 9% and 19%, respectively. Since the underestimation is different for beams and columns, which are subjected to different strain gradients at ultimate, it is suggested that the maximum concrete stresses developed in flexure should depend also on strain gradient. The effects of strain gradient on the concrete stress developed in flexure were investigated in this work by testing RC columns under concentric and eccentric axial loads or horizontal loads. The concrete stress–strain curves of the eccentrically/horizontally loaded specimens were derived by modifying those of concentrically loaded counterparts based on axial force and moment equilibriums. The results indicate that the maximum concrete stress developed in flexure depends significantly on strain gradient. Formulas were developed to correlate the maximum and equivalent concrete stresses developed in flexure to the strain gradient. Their applicability was verified by comparing the results with measured flexural strengths of RC beams and columns.
Persistent Identifierhttp://hdl.handle.net/10722/180924
ISSN
2015 Impact Factor: 0.429
2015 SCImago Journal Rankings: 0.323
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorPeng, J-
dc.contributor.authorHo, JCM-
dc.date.accessioned2013-02-06T03:25:29Z-
dc.date.available2013-02-06T03:25:29Z-
dc.date.issued2012-
dc.identifier.citationProceedings of the Institution of Civil Engineers: Structures and Buildings, 2012, v. 165 n. 10, p. 543-565-
dc.identifier.issn0965-0911-
dc.identifier.urihttp://hdl.handle.net/10722/180924-
dc.description.abstractThe stress–strain characteristic of concrete developed in flexure is one of the essential parameters for the ultimate flexural strength design of reinforced concrete (RC) members. Currently, the stress–strain curve of concrete developed in flexure is obtained by scaling down the uniaxial stress–strain curve. In current RC design codes, it is represented by an equivalent rectangular concrete stress block depending solely on the concrete strength. By comparing the theoretical strength evaluated for the stress block with the measured strength, the authors found that current codes underestimate the actual flexural strength of RC beams and columns by 9% and 19%, respectively. Since the underestimation is different for beams and columns, which are subjected to different strain gradients at ultimate, it is suggested that the maximum concrete stresses developed in flexure should depend also on strain gradient. The effects of strain gradient on the concrete stress developed in flexure were investigated in this work by testing RC columns under concentric and eccentric axial loads or horizontal loads. The concrete stress–strain curves of the eccentrically/horizontally loaded specimens were derived by modifying those of concentrically loaded counterparts based on axial force and moment equilibriums. The results indicate that the maximum concrete stress developed in flexure depends significantly on strain gradient. Formulas were developed to correlate the maximum and equivalent concrete stresses developed in flexure to the strain gradient. Their applicability was verified by comparing the results with measured flexural strengths of RC beams and columns.-
dc.languageeng-
dc.publisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.icevirtuallibrary.com/content/serial/stbu-
dc.relation.ispartofProceedings of the Institution of Civil Engineers: Structures and Buildings-
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.subjectColumns-
dc.subjectConcrete structures-
dc.subjectDesign methods & aids-
dc.titleStrain gradient effects on concrete stress-strain curveen_US
dc.typeArticleen_US
dc.identifier.emailHo, JCM: johnny.ho@hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1680/stbu.10.00056-
dc.identifier.hkuros191309-
dc.identifier.volume165-
dc.identifier.issue10-
dc.identifier.spage543-
dc.identifier.epage565-
dc.identifier.isiWOS:000311676400003-
dc.publisher.placeUnited Kingdom-

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