Strain-gradient-dependent stress-strain curve for normal-strength concrete

Ho, J. C. M. and Peng, J. (2013) Strain-gradient-dependent stress-strain curve for normal-strength concrete. Advances in Structural Engineering, 16 11: 1911-1930. doi:10.1260/1369-4332.16.11.1911

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Author Ho, J. C. M.
Peng, J.
Title Strain-gradient-dependent stress-strain curve for normal-strength concrete
Journal name Advances in Structural Engineering   Check publisher's open access policy
ISSN 1369-4332
2048-4011
Publication date 2013-11-01
Sub-type Article (original research)
DOI 10.1260/1369-4332.16.11.1911
Volume 16
Issue 11
Start page 1911
End page 1930
Total pages 20
Place of publication Brentwood, Essex, United Kingdom
Publisher Multi-Science Publishing
Collection year 2014
Language eng
Subject 2205 Civil and Structural Engineering
2215 Building and Construction
Abstract The stress-strain distribution of concrete in the compression zone of reinforced concrete (RC) flexural members is the most important parameter for assessing the ultimate flexural strength and ductility. Currently, the stress-strain curve of concrete developed in flexure is taken as the uni-axial compressive curve incorporating a scale-down factor k3, which is the ratio of the maximum concrete stress developed under flexure to the concrete cylinder strength. In current RC design codes, the ratio of the equivalent concrete stress to cylinder strength is taken as constant equal to 0.85 for normal-strength concrete but reduces as concrete strength increases. However, in a recent study carried out by the authors, it was found that the maximum concrete stress developed in the flexure increases significantly as the strain gradient (ratio of extreme concrete strain to neutral axis depth) increases, until reaching a maximum limit. Therefore, the value of k3 should not be taken as a constant for flexural RC members. In this study, the authors will adopt the results obtained in the previous experimental tests on concentrically, eccentrically and horizontally loaded RC columns to derive the stress-strain curve of concrete under different extents of strain gradient. The derived values of k3 are then correlated to the strain gradient using empirical equation. The applicability of the proposed equation is checked by comparing the flexural strengths of NSC beams and columns so calculated with those experimentally measured by different researchers, in which good agreement has been obtained.
Keyword Flexural strength
Maximum concrete stress
Normal-strength concrete
Strain gradient
Stress-strain curve
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2014 Collection
 
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