Limited deformability design of high-strength concrete beams in low to moderate seismicity regions

Ho, Johnny Ching-Ming and Zhou, Kevin Jian-Hui (2011) Limited deformability design of high-strength concrete beams in low to moderate seismicity regions. Journal of Civil Engineering and Management, 17 3: 409-423. doi:10.3846/13923730.2011.594219


Author Ho, Johnny Ching-Ming
Zhou, Kevin Jian-Hui
Title Limited deformability design of high-strength concrete beams in low to moderate seismicity regions
Journal name Journal of Civil Engineering and Management   Check publisher's open access policy
ISSN 1392-3730
1822-3605
Publication date 2011-09
Sub-type Article (original research)
DOI 10.3846/13923730.2011.594219
Open Access Status
Volume 17
Issue 3
Start page 409
End page 423
Total pages 15
Place of publication Vilnius, Lithuania
Publisher Vilniaus Gedimino Technikos Universitetas
Abstract In the design of reinforced concrete (RC) beams located in low-moderate seismicity regions, adequate flexural deformability apart from flexural strength to cater for the imposed seismic demand should be designed. As per the existing RC design codes, this is achieved by restricting the maximum neutral axis depth or tension steel ratio, or limiting the minimum confining steel. However, these deemed-to-satisfy rules were derived many years ago based on normal-strength concrete and steel, which would impair the deformability when applied directly to RC beams made of high-strength materials. To resolve the problem, a new design method based on a prescribed deformability is advocated. In this study, the authors proposed that instead of complying with the deemed-to-satisfy rules, a consistent deformability derived based on the design requirements of Eurocode 2 should be provided to all RC beams located in low-moderate seismicity regions. Using the theoretical formulas developed previously by the authors, two different sets of design values expressed in terms of maximum tension steel ratio and neutral axis to beam effective depths for different concrete and steel yield strengths are evaluated. Finally, simplified guidelines for designing RC beams satisfying the proposed deformability requirement are developed for practical design application.
Keyword Beams
Confinement
Curvature
Deformability
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, 17:42:09 EST by Johnny Ho on behalf of School of Civil Engineering