Plastic mechanism analysis of unstiffened steel I-section beams strengthened with CFRP under 3-point bending

Elchalakani, Mohamed and Fernando, Dilum (2012) Plastic mechanism analysis of unstiffened steel I-section beams strengthened with CFRP under 3-point bending. Thin-Walled Structures, 53 58-71. doi:10.1016/j.tws.2012.01.005


Author Elchalakani, Mohamed
Fernando, Dilum
Title Plastic mechanism analysis of unstiffened steel I-section beams strengthened with CFRP under 3-point bending
Journal name Thin-Walled Structures   Check publisher's open access policy
ISSN 0263-8231
1879-3223
Publication date 2012-04-01
Sub-type Article (original research)
DOI 10.1016/j.tws.2012.01.005
Volume 53
Start page 58
End page 71
Total pages 14
Place of publication Oxford, United Kingdom
Publisher Pergamon
Language eng
Formatted abstract
This paper presents experiments and theoretical analysis of 16 steel I-section beams strengthened using externally bonded CFRP under quasi-static large deformation 3-point bending. The main parameters examined in this paper were the section and member slenderness and the location of the CFRP plates. The member slenderness examined in this paper was in the range of Le/ry=40–92. The section slenderness examined in this paper was in the range of b/tf=6.25–16.67. The CFRP plates were added either to the tension flange or both compression and tension flanges or even to the whole section including the web. An expression for the yield and plastic moments of the composite section were obtained by means of an equivalent thickness approach for the web and flange. The newly obtained strength results were compared against the present design rules in steel specifications. The CFRP increased the strength by up to 32% for compression and tension flange strengthening whereas the strength increased only by 15% for tension flange strengthening. The per cent increase in strength for short specimens was mostly affected by the section slenderness where the maximum gain was obtained for the semi-compact section. Plastic mechanism analysis was performed to predict the collapse curves. Good agreement was found between the theoretical and experimental post buckling load–deflection curves.
Keyword Steel I-section
CFRP strengthening
Retrofit
Large deformation bending
Lateral torsion buckling
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: Mon, 16 Sep 2013, 20:20:48 EST by Dilum Fernando on behalf of School of Civil Engineering