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Article: An experimental study on strain gradient effect of equivalent rectangular stress block of normal-strength concrete
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TitleAn experimental study on strain gradient effect of equivalent rectangular stress block of normal-strength concrete
 
AuthorsPeng, J1
Pam, HJ1
Wong, YL2
 
KeywordsEquivalent Concrete Stress
Flexural Strength
Maximum Concrete Stress
Strain Gradient Effect
Uni-Axial Strength
 
Issue Date2010
 
PublisherHong Kong Institution of Engineers. The Journal's web site is located at http://www.hkie.org.hk/html/publications/transactions/index.asp
 
CitationTransactions Hong Kong Institution Of Engineers, 2010, v. 17 n. 4, p. 12-22 [How to Cite?]
 
AbstractIn flexural strength design of normal-strength reinforced concrete (RC) members, the maximum concrete stress adopted by various design codes is originated from the scaled down uni-axial concrete stress-strain curve, in that the behaviour of concrete under flexure is wrongly considered to be more inferior than that under uni-axial compression. Therefore, from published literature, this scaled down concrete stress might be the reason for significant disparity between theoretical and actual flexural strengths. In this study, 12 test specimens, including plain concrete and RC, were fabricated to investigate the maximum concrete stress developed under flexure affected by strain gradient. These specimens were cast in several batches, each batch consisted of one concentrically loaded specimen and one or several eccentrically loaded specimen(s). The concrete stress-strain curve developed in each of the eccentrically loaded specimens was derived by modifying that of its counterpart concentrically loaded specimen based on axial force and moment equilibriums. From the obtained stress-strain curves, it was found that the maximum concrete stress developed In flexure Increased with strain gradient. A formula correlating the maximum concrete stress in flexure to strain gradient is thus developed. Lastly, the widely used equivalent rectangular concrete stress block parameters stipulated in the Hong Kong Concrete code are modified by considering the strain gradient effects.
 
ISSN1023-697X
2013 SCImago Journal Rankings: 0.114
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorPeng, J
 
dc.contributor.authorPam, HJ
 
dc.contributor.authorWong, YL
 
dc.date.accessioned2012-06-26T06:05:40Z
 
dc.date.available2012-06-26T06:05:40Z
 
dc.date.issued2010
 
dc.description.abstractIn flexural strength design of normal-strength reinforced concrete (RC) members, the maximum concrete stress adopted by various design codes is originated from the scaled down uni-axial concrete stress-strain curve, in that the behaviour of concrete under flexure is wrongly considered to be more inferior than that under uni-axial compression. Therefore, from published literature, this scaled down concrete stress might be the reason for significant disparity between theoretical and actual flexural strengths. In this study, 12 test specimens, including plain concrete and RC, were fabricated to investigate the maximum concrete stress developed under flexure affected by strain gradient. These specimens were cast in several batches, each batch consisted of one concentrically loaded specimen and one or several eccentrically loaded specimen(s). The concrete stress-strain curve developed in each of the eccentrically loaded specimens was derived by modifying that of its counterpart concentrically loaded specimen based on axial force and moment equilibriums. From the obtained stress-strain curves, it was found that the maximum concrete stress developed In flexure Increased with strain gradient. A formula correlating the maximum concrete stress in flexure to strain gradient is thus developed. Lastly, the widely used equivalent rectangular concrete stress block parameters stipulated in the Hong Kong Concrete code are modified by considering the strain gradient effects.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationTransactions Hong Kong Institution Of Engineers, 2010, v. 17 n. 4, p. 12-22 [How to Cite?]
 
dc.identifier.epage22
 
dc.identifier.hkuros206053
 
dc.identifier.issn1023-697X
2013 SCImago Journal Rankings: 0.114
 
dc.identifier.issue4
 
dc.identifier.scopuseid_2-s2.0-79952561444
 
dc.identifier.spage12
 
dc.identifier.urihttp://hdl.handle.net/10722/150555
 
dc.identifier.volume17
 
dc.languageeng
 
dc.publisherHong Kong Institution of Engineers. The Journal's web site is located at http://www.hkie.org.hk/html/publications/transactions/index.asp
 
dc.publisher.placeHong Kong
 
dc.relation.ispartofTransactions Hong Kong Institution of Engineers
 
dc.relation.referencesReferences in Scopus
 
dc.subjectEquivalent Concrete Stress
 
dc.subjectFlexural Strength
 
dc.subjectMaximum Concrete Stress
 
dc.subjectStrain Gradient Effect
 
dc.subjectUni-Axial Strength
 
dc.titleAn experimental study on strain gradient effect of equivalent rectangular stress block of normal-strength concrete
 
dc.typeArticle
 
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<contributor.author>Pam, HJ</contributor.author>
<contributor.author>Wong, YL</contributor.author>
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<description.abstract>In flexural strength design of normal-strength reinforced concrete (RC) members, the maximum concrete stress adopted by various design codes is originated from the scaled down uni-axial concrete stress-strain curve, in that the behaviour of concrete under flexure is wrongly considered to be more inferior than that under uni-axial compression. Therefore, from published literature, this scaled down concrete stress might be the reason for significant disparity between theoretical and actual flexural strengths. In this study, 12 test specimens, including plain concrete and RC, were fabricated to investigate the maximum concrete stress developed under flexure affected by strain gradient. These specimens were cast in several batches, each batch consisted of one concentrically loaded specimen and one or several eccentrically loaded specimen(s). The concrete stress-strain curve developed in each of the eccentrically loaded specimens was derived by modifying that of its counterpart concentrically loaded specimen based on axial force and moment equilibriums. From the obtained stress-strain curves, it was found that the maximum concrete stress developed In flexure Increased with strain gradient. A formula correlating the maximum concrete stress in flexure to strain gradient is thus developed. Lastly, the widely used equivalent rectangular concrete stress block parameters stipulated in the Hong Kong Concrete code are modified by considering the strain gradient effects.</description.abstract>
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<subject>Equivalent Concrete Stress</subject>
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Author Affiliations
  1. The University of Hong Kong
  2. Hong Kong Polytechnic University