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Title: Design-oriented model for circular F-STC stub columns subjected to axial compression
Authors: Xu, T
Liu, J
Yu, T 
Guo, Y
Issue Date: Jul-2020
Source: Journal of constructional steel research, July 2020, v. 170, 106061
Abstract: A fiber-reinforced polymer (FRP)-steel composite tubed concrete (F-STC) column is formed by wrapping FRP sheets around a steel tubed concrete column (STC). Both the strength and deformability of the core concrete are improved by the FRP-steel composite tube and the steel tube is prevented from corrosion. A number of studies have been conducted on the prediction of stress-strain behavior of FRP-confined concrete columns and steel tube-confined concrete columns. However, few models focus on the concrete under combined confinement of FRP and steel tube. This paper presents an analytical study on the design-oriented model for F-STC columns. To determine the confining stress, the stress distribution of steel tube was firstly analyzed and the equivalent stress was obtained. In addition, a strain efficiency factor was proposed for the prediction of rupture strain of FRP. Then the peak condition and ultimate condition of F-STC columns were investigated and related predicting models for the load bearing capacity and deformation were proposed. Finally, design-oriented models were proposed for F-STC columns with different types of axial load-strain curves and generally coincided well with the existing test results.
Keywords: Design-oriented model
Equivalent stress
FRP-steel composite tubed concrete
Strain efficiency factor
Stub column
Publisher: Elsevier
Journal: Journal of constructional steel research 
ISSN: 0143-974X
EISSN: 1873-5983
DOI: 10.1016/j.jcsr.2020.106061
Rights: © 2020 Elsevier Ltd. All rights reserved.
© 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
The following publication Xu, T., Liu, J., Yu, T., & Guo, Y. (2020). Design-oriented model for circular F-STC stub columns subjected to axial compression. Journal of Constructional Steel Research, 170, 106061 is available at https://dx.doi.org/10.1016/j.jcsr.2020.106061.
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