Effect of Temperature on Bond Behavior of Externally Bonded FRP Laminates with Mechanical End Anchorage
Publication: Journal of Composites for Construction
Volume 23, Issue 5
Abstract
The use of mechanical anchorage systems can delay or prevent premature failure of RC structures with externally bonded fiber-reinforced polymer (EB-FRP) laminates. This work reports the results of an experimental program aimed at studying the bond behavior of a metallic anchorage plate, typically used for prestressed EB-FRP systems. The overall experimental program comprised 17 concrete prisms with carbon fiber–reinforced polymer (CFRP) laminates externally bonded to the concrete with mechanical anchorage at the end and to which different levels of normal stress were applied. Direct shear tests were carried out using two configurations: (1) steady-state tests, in which the laminate was pulled out from the block with increasing force and at constant temperature (20°C, 60°C, and 80°C); and (2) transient tests, in which the laminate was pulled out with constant force (0.36%, 0.45% and 0.54% of strain) and the temperature was gradually increased. Experimental results showed that the ultimate capacity of the mechanical anchorage can decrease by 44%–59% depending on the temperature and level of normal stress.
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Acknowledgments
This work was supported by FEDER funds through the Operational Program for Competitiveness Factors—COMPETE and National Funds through the Portuguese Foundation for Science and Technology (FCT) under Project No. FRPLongDur POCI-01-0145-FEDER-016900 (FCT PTDC/ECM-EST/1282/2014) and partly financed by Project POCI-01-0145-FEDER-007633. The first author acknowledges Grant No. SFRH/BD/98309/2013 provided by FCT. The second author acknowledges the Spanish Government (Ministerio de Educación, Cultura y Deporte) for the José Castillejo grant ref. CAS16/00288. Finally, the authors also thank all the companies that supported and contributed to the development of this study, including S&P Clever Reinforcement Ibérica for providing the laminates, epoxy adhesive, and metallic anchorage plates; Hilti Portugal-Produtos e Serviços for providing the chemical bond agent to fix the anchor bolts; and Tecnipor–Gomes & Taveira for producing the concrete blocks.
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©2019 American Society of Civil Engineers.
History
Received: Feb 19, 2018
Accepted: Feb 4, 2019
Published online: Jul 18, 2019
Published in print: Oct 1, 2019
Discussion open until: Dec 18, 2019
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