Equivalent stress block for normal-strength concrete incorporating strain gradient effect

Peng, Jun, Ho, Johnny Ching Ming, Pam, Hoat Joen and Wong, Yuk Lung (2012) Equivalent stress block for normal-strength concrete incorporating strain gradient effect. Magazine of Concrete Research, 64 1: 1-19. doi:10.1680/macr.2012.64.1.1

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Author Peng, Jun
Ho, Johnny Ching Ming
Pam, Hoat Joen
Wong, Yuk Lung
Title Equivalent stress block for normal-strength concrete incorporating strain gradient effect
Journal name Magazine of Concrete Research   Check publisher's open access policy
ISSN 0024-9831
1751-763X
Publication date 2012-01-01
Year available 2012
Sub-type Article (original research)
DOI 10.1680/macr.2012.64.1.1
Open Access Status File (Publisher version)
Volume 64
Issue 1
Start page 1
End page 19
Total pages 19
Place of publication London, United Kingdom
Publisher I C E Publishing
Collection year 2012
Language eng
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.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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Created: Thu, 23 Oct 2014, 17:40:24 EST by Johnny Ho on behalf of School of Civil Engineering