Axial and lateral stress-strain model for concrete-filled steel tubes with FRP jackets

Dong, C. X., Kwan, A. K. H. and Ho, J. C. M. (2016) Axial and lateral stress-strain model for concrete-filled steel tubes with FRP jackets. Engineering Structures, 126 365-378. doi:10.1016/j.engstruct.2016.07.059

Author Dong, C. X.
Kwan, A. K. H.
Ho, J. C. M.
Title Axial and lateral stress-strain model for concrete-filled steel tubes with FRP jackets
Journal name Engineering Structures   Check publisher's open access policy
ISSN 1873-7323
Publication date 2016-11-01
Sub-type Article (original research)
DOI 10.1016/j.engstruct.2016.07.059
Open Access Status Not yet assessed
Volume 126
Start page 365
End page 378
Total pages 14
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Subject 2205 Civil and Structural Engineering
Abstract In a concrete-filled steel tube under axial compression, since the steel tube has a larger Poisson's ratio than the concrete, delamination at the steel-concrete interface occurs and the steel tube is ineffective in providing confinement at the elastic stage. For resolving this problem and enhancing the concrete confinement, the provision of an external FRP (fiber reinforced polymer) jacket to restrict the lateral expansion of the steel tube is an effective means. Herein, to investigate the effectiveness of FRP-jacketed steel tube confinement, a theoretical model for evaluating the lateral strain, confining stress and axial stress in a concrete-filled steel tube with FRP jacket at various stages of loading is developed. The theoretical model is first applied to analyze specimens tested by other researches to verify its accuracy and then used to work out the FRP confining stiffness required to eliminate steel-concrete delamination and the FRP confining stiffness required to achieve Level I ductility (no strain softening at the inelastic stage until failure).
Keyword Concrete confinement
Concrete-filled steel tube
Confining stress
FRP jacket
Lateral strain of concrete
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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