Title

Behavior of GFRP bar-reinforced hollow-core polypropylene fiber and glass fiber concrete columns under axial compression

Publication Name

Journal of Building Engineering

Abstract

This study experimentally investigated the behavior of glass fiber-reinforced polymer (GFRP) reinforced hollow-core concrete specimens under concentric axial compression. The effect of the type of concrete (non-fibrous concrete, i.e., normal concrete without the addition of fibers; polypropylene fiber concrete; and glass fiber concrete) and pitches of the GFRP helices on the behavior of GFRP bar-reinforced hollow-core concrete specimens were investigated. The experimental program consisted of seven circular hollow-core specimens with an outer diameter of 214 mm, an inner circular hole diameter of 56 mm, and a height of 850 mm. The failure modes, axial load carrying capacity, and ductility of GFRP bar-reinforced hollow-core concrete specimens were investigated. The experimental results showed that, for a similar amount of reinforcement, the GFRP bar-reinforced hollow-core polypropylene fiber concrete (GFRP–HC–PFC) specimen achieved 2% higher maximum axial load and 19% higher ductility than the GFRP bar-reinforced hollow-core non-fibrous concrete (GFRP–HC–NFC) specimen. For a similar amount of reinforcement, the GFRP bar-reinforced hollow-core glass fiber concrete (GFRP–HC–GFC) specimen achieved 14% lower maximum axial load but 9% higher ductility than the GFRP–HC–NFC specimen. The axial load carrying capacity and ductility of the specimens enhanced with the close pitch of the GFRP helices. A simplified equation was developed for GFRP bar-reinforced hollow-core concrete columns, which predicted the axial load capacity of the specimens with reasonable accuracy.

Open Access Status

This publication is not available as open access

Volume

44

Article Number

103245

Funding Sponsor

Higher Education Commission, Pakistan

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.jobe.2021.103245