Experimental and analytical investigation of using externally bonded, hybrid, fiber-reinforced polymers to repair and strengthen heated, damaged RC beams in flexure
Journal of Structural Fire Engineering
ISSN: 2040-2317
Article publication date: 17 December 2021
Issue publication date: 9 August 2022
Abstract
Purpose
This study aims to conduct an experimental study and finite element model (FEM) to investigate the flexural behavior of heat-damaged beams strengthened/repaired by hybrid fiber-reinforced polymers (HFRP).
Design/methodology/approach
Two groups of beams of (150 × 250 × 1,200) mm were cast, strengthened and repaired using different configurations of HFRP and tested under four-point loadings. The first group was kept at room temperature, while the second group was exposed to a temperature of 400°C.
Findings
It was found that using multiple layers of carbon fiber-reinforced polymer (CFRP) and glass fiber-reinforced polymer (GFRP) enhanced the strength more than a single layer. Also, the order of two layers of FRP showed no effect on flexural behavior of beams. Using a three-layer scheme (attaching the GFRP first and followed by two layers of CFRP) exhibited increase in ultimate load more than the scheme attached by CFRP first. Furthermore, the scheme HGC (heated beam repaired with glass and carbon, in sequence) allowed to achieve residual flexural capacity of specimen exposed to 400°C. Typical flexural failure was observed in control and heat-damaged beams, whereas the strengthened/repaired beams failed by cover separation and FRP debonding, however, specimen repaired with two layers of GFRP failed by FRP rupture. The FEM results showed good agreement with experimental results.
Originality/value
Few researchers have studied the effects of HFRP on strengthening and repair of heated, damaged reinforced concrete (RC) beams. This paper investigates, both experimentally and analytically, the performance of externally strengthened and repaired RC beams, in flexure, with different FRP configurations of CFRP and GFRP.
Keywords
Acknowledgements
The authors wish to acknowledge the financial support provided by the deanship of research at Jordan University of Science and Technology via research grant number 13/2018. Also, they wish to acknowledge the assistance of the technicians at the civil engineering laboratories.
Citation
Al Rjoub, Y., Obaidat, A., Ashteyat, A. and Alshboul, K. (2022), "Experimental and analytical investigation of using externally bonded, hybrid, fiber-reinforced polymers to repair and strengthen heated, damaged RC beams in flexure", Journal of Structural Fire Engineering, Vol. 13 No. 3, pp. 391-417. https://doi.org/10.1108/JSFE-09-2021-0059
Publisher
:Emerald Publishing Limited
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