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Conference Paper: Concrete compressive stress distribution of RC members subjected to flexure

TitleConcrete compressive stress distribution of RC members subjected to flexure
Authors
KeywordsFlexure
Rectangular concrete stress block parameters
Reinforced concrete
Strain gradient
Uni-axial concrete stress
Issue Date2009
PublisherResearch Publishing Services.
Citation
The 7th International Conference on Tall Buildings (ICTB-7), Hong Kong, China, 29-30 October 2009. In Proceedings of the 7th International Conference on Tall Buildings, 2009, p. 527-538 How to Cite?
Abstract
In flexural capacity design, the concrete compressive stress-strain curve of reinforced concrete (RC) members is scaled down from the uni-axial concrete stress-strain curve so that the maximum concrete compressive stress adopted in design is less than the uni-axial strength to incorporate the strain gradient effect due to bending. While, the use of the scaled down concrete stress is often found to underestimate the flexural strength of RC members even the material safety factors are taken as unity. In order to investigate the effect of strain gradient on the maximum concrete compressive stress that can be developed in flexural RC members, as well as on the flexural capacity of those members, one pair of plain concrete (PC) and three pairs of RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads. Based on the axial force and moment equilibriums, the maximum concrete compressive stress developed in the eccentrically loaded specimens under strain gradient is determined by modifying the concrete stress-strain curve obtained from the counterpart concentrically loaded specimens. Furthermore, a pair of equivalent rectangular concrete stress block parameters for the purpose of flexural strength design of RC members is determined based on the obtained maximum concrete compressive stress. Comparisons of flexural strengths between the tested results of some RC members conducted by other researchers and the predicted results of those members by the proposal from this study, as well as the theoretical values based on the provisions from some current design codes were made to validate the applicability of those obtained concrete stress block parameters.
DescriptionSession - Concrete and Composite Structures (I)
Persistent Identifierhttp://hdl.handle.net/10722/127212
ISBN

 

DC FieldValueLanguage
dc.contributor.authorPeng, Jen_HK
dc.contributor.authorHo, JCMen_HK
dc.contributor.authorPam, HJen_HK
dc.contributor.authorWong, YLen_HK
dc.date.accessioned2010-10-31T13:12:38Z-
dc.date.available2010-10-31T13:12:38Z-
dc.date.issued2009en_HK
dc.identifier.citationThe 7th International Conference on Tall Buildings (ICTB-7), Hong Kong, China, 29-30 October 2009. In Proceedings of the 7th International Conference on Tall Buildings, 2009, p. 527-538en_HK
dc.identifier.isbn978-962-8014-19-4-
dc.identifier.urihttp://hdl.handle.net/10722/127212-
dc.descriptionSession - Concrete and Composite Structures (I)-
dc.description.abstractIn flexural capacity design, the concrete compressive stress-strain curve of reinforced concrete (RC) members is scaled down from the uni-axial concrete stress-strain curve so that the maximum concrete compressive stress adopted in design is less than the uni-axial strength to incorporate the strain gradient effect due to bending. While, the use of the scaled down concrete stress is often found to underestimate the flexural strength of RC members even the material safety factors are taken as unity. In order to investigate the effect of strain gradient on the maximum concrete compressive stress that can be developed in flexural RC members, as well as on the flexural capacity of those members, one pair of plain concrete (PC) and three pairs of RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads. Based on the axial force and moment equilibriums, the maximum concrete compressive stress developed in the eccentrically loaded specimens under strain gradient is determined by modifying the concrete stress-strain curve obtained from the counterpart concentrically loaded specimens. Furthermore, a pair of equivalent rectangular concrete stress block parameters for the purpose of flexural strength design of RC members is determined based on the obtained maximum concrete compressive stress. Comparisons of flexural strengths between the tested results of some RC members conducted by other researchers and the predicted results of those members by the proposal from this study, as well as the theoretical values based on the provisions from some current design codes were made to validate the applicability of those obtained concrete stress block parameters.-
dc.languageengen_HK
dc.publisherResearch Publishing Services.-
dc.relation.ispartofProceedings of the 7th International Conference on Tall Buildingsen_HK
dc.subjectFlexure-
dc.subjectRectangular concrete stress block parameters-
dc.subjectReinforced concrete-
dc.subjectStrain gradient-
dc.subjectUni-axial concrete stress-
dc.titleConcrete compressive stress distribution of RC members subjected to flexureen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailPeng, J: pengjun@hku.hken_HK
dc.identifier.emailHo, JCM: johnny.ho@hku.hken_HK
dc.identifier.emailPam, HJ: pamhoatj@hku.hk-
dc.identifier.emailWong, YL: ceylwong@inet.polyu.edu.hk-
dc.identifier.authorityHo, JCM=rp00070en_HK
dc.identifier.authorityPam, HJ=rp00071en_HK
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.3850/9789628014194_0058-
dc.identifier.hkuros176111en_HK
dc.identifier.spage527en_HK
dc.identifier.epage538en_HK
dc.publisher.placeSingapore-
dc.description.otherThe 7th International Conference on Tall Buildings (ICTB-7), Hong Kong, China, 29-30 October 2009. In Proceedings of the 7th International Conference on Tall Buildings, 2009, p. 527-538-

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