Unified model for fully and partially FRP confined circular and square concrete columns subjected to axial compression

Shayanfar, Javad, Barros, Joaquim A. and Rezazadeh, Mohammadali (2022) Unified model for fully and partially FRP confined circular and square concrete columns subjected to axial compression. Engineering Structures, 251 (Part A). p. 113355. ISSN 0141-0296

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Official URL: https://doi.org/10.1016/j.engstruct.2021.113355

Abstract

Even though the usage of Fiber-reinforced polymer (FRP) full confinement arrangement is a more reliable and efficient strengthening technique than a partially confining strategy, it might not be cost-effective in real cases of strengthening. Experimental researches have demonstrated that confinement strengthening strategy is more effective for the case of circular columns compared to its application on square columns. This paper is dedicated to introducing a new unified model for determining the concrete confinement characteristics of FRP fully/partially confined circular/square concrete columns subjected to axial compressive loading. Through unification, the variations of the key parameters can be evaluated more-widely based on a unified mathematical framework. Consequently, it leads to the continuity in the predictions of FRP confinement-induced improvements for the different types of columns, contrary to those obtained from models only applicable to a specified cross-section or confining system. The substantial influence of non-homogenous concrete expansion distribution at the horizontal and vertical directions is taken into account in the determination of confinement pressure, besides arching action, by following the concept of confinement efficiency factor. Since the confinement-induced improvement is a function of its confining stress path, a new methodology is proposed to predict global axial stress–strain relation of FRP confined concrete columns considering confinement path effect, based on an extensive set of experimental results including 418 test specimens. The predictive performance of the developed model is assessed by simulating experimental tests reported in the literature.

Item Type: Article
Additional Information: Funding Information: This study is a part of the project ‘‘StreColesf_Innovative technique using effectively composite materials for the strengthening of rectangular cross-section reinforced concrete columns exposed to seismic loadings and fire’’, with the reference POCI-01-0145-FEDER-029485. The firs author also acknowledges the support provided by FCT PhD individual fellowship 2019 with the reference of “SFRH/BD/148002/2019”.
Uncontrolled Keywords: FRP confined concrete, Full confinement, Partial confinement, Square section, Unified model
Subjects: H200 Civil Engineering
H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 11 Jan 2022 11:20
Last Modified: 11 Jan 2022 11:30
URI: http://nrl.northumbria.ac.uk/id/eprint/48130

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