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

TitleStrain gradient effects on flexural strength design of normal-strength concrete beams
Authors
KeywordsConcrete strength
Concrete stress
Strain gradient effects
Strength design
Structural design
Issue Date2013
PublisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www.interscience.wiley.com/jpages/1541-7794/
Citation
The Structural Design of Tall and Special Buildings, 2013, v. 22 n. 1, p. 29-49 How to Cite?
AbstractIn the flexural strength design of normal-strength concrete (NSC) beams, the resultant concrete force and its centroid within the compression zone is generally expressed in an equivalent rectangular stress block. The equivalent concrete stress is expressed as, where is the uni-axial concrete cylinder strength. Currently, the value of α stipulated in various design codes for NSC is taken as 0.85. Nonetheless, in an experimental study conducted earlier by the authors on NSC columns subjected to concentric and eccentric axial loads, it was found that the value of α significantly depends on strain gradient, which generally increases as strain gradient increases until it reaches a maximum value. Therefore, strain gradient is a critical factor and should be considered in the flexural strength design of NSC members. In this paper, a new flexural strength design method that incorporates the effects of strain gradient is developed for NSC beams. An equivalent rectangular concrete stress block, which is strain-gradient dependent, is proposed and applied to produce a set of equations for the flexural strength design of singly and doubly reinforced NSC beams with various concrete strengths. Lastly, these equations are converted into charts for practical design application. © 2010 John Wiley & Sons, Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/124609
ISSN
2015 Impact Factor: 0.898
2015 SCImago Journal Rankings: 0.690
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHo, JCMen_HK
dc.contributor.authorPeng, Jen_HK
dc.date.accessioned2010-10-31T10:44:00Z-
dc.date.available2010-10-31T10:44:00Z-
dc.date.issued2013en_HK
dc.identifier.citationThe Structural Design of Tall and Special Buildings, 2013, v. 22 n. 1, p. 29-49en_HK
dc.identifier.issn1541-7794-
dc.identifier.urihttp://hdl.handle.net/10722/124609-
dc.description.abstractIn the flexural strength design of normal-strength concrete (NSC) beams, the resultant concrete force and its centroid within the compression zone is generally expressed in an equivalent rectangular stress block. The equivalent concrete stress is expressed as, where is the uni-axial concrete cylinder strength. Currently, the value of α stipulated in various design codes for NSC is taken as 0.85. Nonetheless, in an experimental study conducted earlier by the authors on NSC columns subjected to concentric and eccentric axial loads, it was found that the value of α significantly depends on strain gradient, which generally increases as strain gradient increases until it reaches a maximum value. Therefore, strain gradient is a critical factor and should be considered in the flexural strength design of NSC members. In this paper, a new flexural strength design method that incorporates the effects of strain gradient is developed for NSC beams. An equivalent rectangular concrete stress block, which is strain-gradient dependent, is proposed and applied to produce a set of equations for the flexural strength design of singly and doubly reinforced NSC beams with various concrete strengths. Lastly, these equations are converted into charts for practical design application. © 2010 John Wiley & Sons, Ltd.-
dc.languageengen_HK
dc.publisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www.interscience.wiley.com/jpages/1541-7794/-
dc.relation.ispartofThe Structural Design of Tall and Special Buildings-
dc.rightsThe Structural Design of Tall and Special Buildings. Copyright © John Wiley & Sons Ltd.-
dc.subjectConcrete strength-
dc.subjectConcrete stress-
dc.subjectStrain gradient effects-
dc.subjectStrength design-
dc.subjectStructural design-
dc.titleStrain gradient effects on flexural strength design of normal-strength concrete beamsen_HK
dc.typeArticleen_HK
dc.identifier.emailHo, JCM: johnny.ho@hku.hken_HK
dc.identifier.authorityHo, JCM=rp00070en_HK
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1002/tal.655-
dc.identifier.scopuseid_2-s2.0-84871824312-
dc.identifier.hkuros176105en_HK
dc.identifier.volume22en_HK
dc.identifier.issue1-
dc.identifier.spage29-
dc.identifier.epage49-
dc.identifier.isiWOS:000312948600003-
dc.publisher.placeUnited Kingdom-

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