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Article: Equivalent stress block for normal-strength concrete incorporating strain gradient effect
Title | Equivalent stress block for normal-strength concrete incorporating strain gradient effect | ||||
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Authors | |||||
Issue Date | 2012 | ||||
Publisher | Thomas Telford (ICE Publishing). The Journal's web site is located at http://www.concrete-research.com | ||||
Citation | Magazine Of Concrete Research, 2012, v. 64 n. 1, p. 1-19 How to Cite? | ||||
Abstract | To account for the different behaviours of concrete under uniaxial compression and bending in the flexural strength design of reinforced concrete (RC) members, the stress-strain curve of concrete is normally scaled down so that the adopted maximum concrete stress in flexural members is less than the uniaxial strength. However, it was found from previous experimental research that the use of a smaller maximum concrete stress would underestimate the flexural strength of RC beams and columns. To investigate the effect of strain gradient on the maximum concrete stress developed in flexure, a total of 12 plain concrete and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads separately. The maximum concrete stress developed in the eccentric specimens was determined by modifying the concrete stress-strain curve obtained from the counterpart concentric specimens based on axial force and moment equilibriums. The test results revealed that the maximum concrete stress increases with strain gradient up to a certain maximum value. A formula was developed to correlate the maximum concrete stress to strain gradient. A pair of equivalent rectangular concrete stress block parameters that incorporate the effects of strain gradient was proposed for flexural strength design of RC members. © 2012 Thomas Telford Ltd. | ||||
Persistent Identifier | http://hdl.handle.net/10722/137254 | ||||
ISSN | 2023 Impact Factor: 1.8 2023 SCImago Journal Rankings: 0.570 | ||||
ISI Accession Number ID |
Funding Information: A research grant from the Seed Funding Programme for Basic Research (account code 10208226) of The University of Hong Kong (HKU) for the work presented here is gratefully acknowledged. The authors gratefully thank the Department of Civil and Structural Engineering of The Hong Kong Polytechnic University (PolyU), where most of the experimental tests were conducted. Support from technical staff in the structural laboratory of PolyU and HKU Department of Civil Engineering are greatly appreciated. | ||||
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Peng, J | en_HK |
dc.contributor.author | Ho, JCM | en_HK |
dc.contributor.author | Pam, HJ | en_HK |
dc.contributor.author | Wong, YL | en_HK |
dc.date.accessioned | 2011-08-26T14:21:48Z | - |
dc.date.available | 2011-08-26T14:21:48Z | - |
dc.date.issued | 2012 | en_HK |
dc.identifier.citation | Magazine Of Concrete Research, 2012, v. 64 n. 1, p. 1-19 | en_HK |
dc.identifier.issn | 0024-9831 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/137254 | - |
dc.description.abstract | To account for the different behaviours of concrete under uniaxial compression and bending in the flexural strength design of reinforced concrete (RC) members, the stress-strain curve of concrete is normally scaled down so that the adopted maximum concrete stress in flexural members is less than the uniaxial strength. However, it was found from previous experimental research that the use of a smaller maximum concrete stress would underestimate the flexural strength of RC beams and columns. To investigate the effect of strain gradient on the maximum concrete stress developed in flexure, a total of 12 plain concrete and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads separately. The maximum concrete stress developed in the eccentric specimens was determined by modifying the concrete stress-strain curve obtained from the counterpart concentric specimens based on axial force and moment equilibriums. The test results revealed that the maximum concrete stress increases with strain gradient up to a certain maximum value. A formula was developed to correlate the maximum concrete stress to strain gradient. A pair of equivalent rectangular concrete stress block parameters that incorporate the effects of strain gradient was proposed for flexural strength design of RC members. © 2012 Thomas Telford Ltd. | en_HK |
dc.language | eng | en_US |
dc.publisher | Thomas Telford (ICE Publishing). The Journal's web site is located at http://www.concrete-research.com | en_HK |
dc.relation.ispartof | Magazine of Concrete Research | en_HK |
dc.title | Equivalent stress block for normal-strength concrete incorporating strain gradient effect | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Ho, JCM:johnny.ho@hku.hk Pam, HJ: pamhoatj@hku.hk | en_HK |
dc.identifier.authority | Ho, JCM=rp00070 Pam, HJ=rp00071 | en_HK |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1680/macr.2012.64.1.1 | en_HK |
dc.identifier.scopus | eid_2-s2.0-84858255959 | en_HK |
dc.identifier.hkuros | 206054 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-84858255959&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 64 | en_HK |
dc.identifier.issue | 1 | en_HK |
dc.identifier.spage | 1 | en_HK |
dc.identifier.epage | 19 | en_HK |
dc.identifier.eissn | 1751-763X | - |
dc.identifier.isi | WOS:000298481900001 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Peng, J=35335169300 | en_HK |
dc.identifier.scopusauthorid | Ho, JCM=24831880500 | en_HK |
dc.identifier.scopusauthorid | Pam, HJ=55086308600 | en_HK |
dc.identifier.scopusauthorid | Wong, YL=7403041495 | en_HK |
dc.identifier.issnl | 0024-9831 | - |