Compression behavior of GFRP bars under elevated In-Service temperatures
Article
Article Title | Compression behavior of GFRP bars under elevated In-Service temperatures |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Alajarmeh, Omar, Manalo, Allan, Benmokrane, Brahim, Schubel, Peter, Zeng, Xuesen, Ahmad, Afaq, Hassanli, Reza and Sorbello, Charles-Dean |
Journal Title | Construction and Building Materials |
Journal Citation | 314 (Part A) |
Article Number | 125675 |
Number of Pages | 12 |
Year | 2022 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2021.125675 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S0950061821034097 |
Abstract | The use of glass fiber-reinforced polymer (GFRP) bars is becoming accepted as internal longitudinal reinforcement in concrete members subject to compressive load. In building and construction, GFRP reinforcement is subject to elevated in-service temperatures that might soften the polymer matrix and affect the mechanical properties of the reinforcement. That notwithstanding, information on the compressive behavior of GFRP bars under elevated in-service temperatures is limited. This study investigated the effects of elevated in-service temperatures ranging from 23℃ to 140℃ and different slenderness ratios (Lu/db)) of 4, 8, and 16 on the compressive behavior of GFRP bars. The test results show that the failure mode of GFRP bars changed from fiber-dominant to matrix-dominant with increased temperature. Similarly, the increase in Lu/db ratio changed the failure from shear-crushing to buckling-splitting failure. Furthermore, the GFRP bars retained most of their compressive strength when exposed to temperatures of up to 60℃, but significantly decreased thereafter. The compressive strength retention of the GFRP bars at 140℃ was around 20% regardless of the Lu/db ratio. Based on these results, prediction equations were derived to reliably describe the compressive behavior of GFRP bars and to appropriately determine the minimum concrete cover needed to effectively design GFRP-reinforced concrete members under compression exposed to elevated in-service temperatures. |
Keywords | Buckling; Compressive test; Elevated temperature; GFRP bars; Matrix softening; Slenderness ratio |
ANZSRC Field of Research 2020 | 401602. Composite and hybrid materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Centre for Future Materials (Research) |
Institute for Advanced Engineering and Space Sciences (Operations) | |
School of Engineering | |
Centre for Future Materials | |
Institute for Advanced Engineering and Space Sciences | |
iLAuNCH (Operations) | |
Centre for Future Materials (Operations) | |
University of Engineering and Technology Taxila, Pakistan | |
University of South Australia | |
Department of Transport and Main Roads, Queensland |
https://research.usq.edu.au/item/z018w/compression-behavior-of-gfrp-bars-under-elevated-in-service-temperatures
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