Improving design limits of strength and ductility of NSC beam by considering strain gradient effect

Ho, J. C. M. and Peng, J. (2013) Improving design limits of strength and ductility of NSC beam by considering strain gradient effect. Structural Engineering and Mechanics, 47 2: 185-207. doi:10.12989/sem.2013.47.2.185

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Author Ho, J. C. M.
Peng, J.
Title Improving design limits of strength and ductility of NSC beam by considering strain gradient effect
Journal name Structural Engineering and Mechanics   Check publisher's open access policy
ISSN 1225-4568
Publication date 2013-07-25
Sub-type Article (original research)
DOI 10.12989/sem.2013.47.2.185
Open Access Status
Volume 47
Issue 2
Start page 185
End page 207
Total pages 23
Place of publication Daejeon, Republic of Korea
Publisher Techno-Press
Language eng
Subject 2205 Civil and Structural Engineering
2215 Building and Construction
2210 Mechanical Engineering
2211 Mechanics of Materials
Abstract In flexural strength design of normal-strength concrete (NSC) beams, it is commonly accepted that the distribution of concrete stress within the compression zone can be reasonably represented by an equivalent rectangular stress block. The stress block is governed by two parameters, which are normally denoted by α and β to stipulate the width and depth of the stress block. Currently in most of the reinforced concrete (RC) design codes, α and β are usually taken as 0.85 and 0.80 respectively for NSC. Nonetheless, in an experimental study conducted earlier by the authors on NSC columns, it was found that α increases significantly with strain gradient, which means that larger concrete stress can be developed in flexure. Consequently, less tension steel will be required for a given design flexural strength, which improves the ductility performance. In this study, the authors' previously proposed strain-gradient-dependent concrete stress block will be adopted to produce a series of design charts showing the maximum design limits of flexural strength and ductility of singly-and doubly-NSC beams. Through the design charts, it can be verified that the consideration of strain gradient effect can improve significantly the flexural strength and ductility design limits of NSC beams.
Keyword Beams
Concrete stress block
Normal-strength concrete
Strain gradient
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
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Created: Fri, 29 Nov 2013, 03:42:30 EST by System User on behalf of School of Civil Engineering