Article: Maximum concrete stress developed in unconfined flexural RC members

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- Dr Pam, Hoat Joen

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Title	Maximum concrete stress developed in unconfined flexural RC members
Authors	Ho, JCM1 Pam, HJ1 Peng, J1 Wong, YL2
Keywords	Rectangular Stress Block Parameters Reinforced Concrete Strain Gradient Uni-Axial Concrete Stress
Issue Date	2011
Publisher	Techno-Press. The Journal's web site is located at http://technopress.kaist.ac.kr/?journal=cac&subpage=6
Citation	Computers And Concrete, 2011, v. 8 n. 2, p. 207-227 [How to Cite?]
Abstract	In flexural strength design of unconfined reinforced concrete (RC) members, the concrete compressive stress-strain curve is scaled down from the uni-axial stress-strain curve such that the maximum concrete stress adopted in design is less than the uni-axial strength to account for the strain gradient effect. It has been found that the use of this smaller maximum concrete stress will underestimate the flexural strength of unconfined RC members although the safety factors for materials are taken as unity. Herein, in order to investigate the effect of strain gradient on the maximum concrete stress that can be developed in unconfined flexural RC members, several pairs of plain concrete (PC) and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads. From the test results, the maximum concrete stress developed in the eccentric specimens under strain gradient is determined by the modified concrete stress-strain curve obtained from the counterpart concentric specimens based on axial load and moment equilibriums. Based on that, a pair of equivalent rectangular concrete stress block parameters for the purpose of flexural strength design of unconfined RC members is determined.
ISSN	1598-8198 2011 Impact Factor: 1.015 2011 SCImago Journal Rankings: 0.041
References	References in Scopus

DC Field	Value
dc.contributor.author	Ho, JCM
dc.contributor.author	Pam, HJ
dc.contributor.author	Peng, J
dc.contributor.author	Wong, YL
dc.date.accessioned	2012-06-26T06:06:13Z
dc.date.available	2012-06-26T06:06:13Z
dc.date.issued	2011
dc.description.abstract	In flexural strength design of unconfined reinforced concrete (RC) members, the concrete compressive stress-strain curve is scaled down from the uni-axial stress-strain curve such that the maximum concrete stress adopted in design is less than the uni-axial strength to account for the strain gradient effect. It has been found that the use of this smaller maximum concrete stress will underestimate the flexural strength of unconfined RC members although the safety factors for materials are taken as unity. Herein, in order to investigate the effect of strain gradient on the maximum concrete stress that can be developed in unconfined flexural RC members, several pairs of plain concrete (PC) and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads. From the test results, the maximum concrete stress developed in the eccentric specimens under strain gradient is determined by the modified concrete stress-strain curve obtained from the counterpart concentric specimens based on axial load and moment equilibriums. Based on that, a pair of equivalent rectangular concrete stress block parameters for the purpose of flexural strength design of unconfined RC members is determined.
dc.description.nature	Link_to_subscribed_fulltext
dc.identifier.citation	Computers And Concrete, 2011, v. 8 n. 2, p. 207-227 [How to Cite?]
dc.identifier.epage	227
dc.identifier.issn	1598-8198 2011 Impact Factor: 1.015 2011 SCImago Journal Rankings: 0.041
dc.identifier.issue	2
dc.identifier.scopus	eid_2-s2.0-80955140488
dc.identifier.spage	207
dc.identifier.uri	http://hdl.handle.net/10722/150624
dc.identifier.volume	8
dc.language	eng
dc.publisher	Techno-Press. The Journal's web site is located at http://technopress.kaist.ac.kr/?journal=cac&subpage=6
dc.publisher.place	Korea, Republic of
dc.relation.ispartof	Computers and Concrete
dc.relation.references	References in Scopus
dc.subject	Rectangular Stress Block Parameters
dc.subject	Reinforced Concrete
dc.subject	Strain Gradient
dc.subject	Uni-Axial Concrete Stress
dc.title	Maximum concrete stress developed in unconfined flexural RC members
dc.type	Article

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Author Affiliations

The University of Hong Kong
Hong Kong Polytechnic University

Article: Maximum concrete stress developed in unconfined flexural RC members

The HKU Scholars Hub has contact details for these author(s).