Shear Strengthening of Reinforced Concrete T-Beams with Hybrid Composite Plate
Publication: Journal of Composites for Construction
Volume 20, Issue 6
Abstract
This paper aims to evaluate the effectiveness of hybrid composite plates (HCPs) technique for the shear strengthening of the reinforced concrete (RC) T cross-section beams. HCP consists of a thin plate of strain hardening cementitious composite (SHCC) reinforced with carbon fiber reinforced polymer (CFRP) laminates. Two HCPs with different CFRP laminates percentage ( and ) were adopted for the shear strengthening of the beams. The HCPs were bonded to substrate in two different ways. In the first case, the HCPs were bonded using epoxy adhesive, whereas in the second case they were bonded using epoxy adhesive and fixed by mechanical anchors. The effectiveness of this technique was limited by the tensile strength of the concrete cover of the strengthened beams. Therefore, in the second case, mechanical anchors prevented a premature debonding of the HCPs and a certain concrete confinement was applied in the zone of the beam to be strengthened, resulting in favorable effects in terms of shear strengthening. Advanced finite element method (FEM) based numerical simulation was performed by using a constitutive model, whose predictive performance was demonstrated by simulating the experimental tests carried out. After demonstration of the good predictive performance of the numerical model, a parametric study was carried out to study the influence of the shear reinforcement ratio, and the influence of thickness of the HCPs on the beam’s load carrying capacity.
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Acknowledgments
The study presented in this paper is a part of the research project titled “PrePam–Pre-fabricated thin panels by using advanced materials for structural rehabilitation” with reference number of PTDC/ECM/114511/2009 provided by FCT (Fundação para a Ciência e a Tecnologia). The first author acknowledges the research grant provided by this project. The authors also thank the collaboration of the following companies: Clever Reinforcement Iberica for providing the CFRP laminates and epoxy, Sika for the sand and adhesive, Grace for the superplasticizers, Dow Chemical Co. for viscous modifying agents, ENDESA Compostilla power station for the fly ash, and Casais for assisting in the execution of the beams.
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Published In
Journal of Composites for Construction
Volume 20 • Issue 6 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jul 17, 2015
Accepted: Jan 26, 2016
Published online: Apr 1, 2016
Discussion open until: Sep 1, 2016
Published in print: Dec 1, 2016
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