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Flexural Tests for Efficiency Evaluation of Spike Anchors on CFRP-Strengthened Concrete

Spike anchors are one of the most promising techniques to prevent or delay debonding in FRP reinforcement sheets. There are several parameters affecting the anchors’ capacity, such as the embedment length and dowel angle. Regardless of the anchors’ capacity, their contribution to the overall strengt...

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Autores principales: Llauradó, Paula Villanueva, Porres, Rafael Cascón, Blázquez, Alberto Sanchidrián, Olalla, Francisco Santos, Álvarez, Fernando Gómez
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9821658/
https://www.ncbi.nlm.nih.gov/pubmed/36614504
http://dx.doi.org/10.3390/ma16010164
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author Llauradó, Paula Villanueva
Porres, Rafael Cascón
Blázquez, Alberto Sanchidrián
Olalla, Francisco Santos
Álvarez, Fernando Gómez
author_facet Llauradó, Paula Villanueva
Porres, Rafael Cascón
Blázquez, Alberto Sanchidrián
Olalla, Francisco Santos
Álvarez, Fernando Gómez
author_sort Llauradó, Paula Villanueva
collection PubMed
description Spike anchors are one of the most promising techniques to prevent or delay debonding in FRP reinforcement sheets. There are several parameters affecting the anchors’ capacity, such as the embedment length and dowel angle. Regardless of the anchors’ capacity, their contribution to the overall strength of the anchored joint is affected by a larger number of variables, including the bonded length behind the anchors, the number and arrangement of the anchors, and the contact surface between the anchor fan and the FRP sheet. This paper presents experimental results of 10 tests conducted on concrete beams. In the tests, anchored joints reached peak loads up to 155% of those of unanchored, bonded joints. The main finding of the research is that the bond length in front of and behind the anchors affects both the peak load and the overall behaviour, with unbonded anchored joints exhibiting a poor behaviour and premature slippage of the anchor, without achieving its failure due to fibre rupture.
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spelling pubmed-98216582023-01-07 Flexural Tests for Efficiency Evaluation of Spike Anchors on CFRP-Strengthened Concrete Llauradó, Paula Villanueva Porres, Rafael Cascón Blázquez, Alberto Sanchidrián Olalla, Francisco Santos Álvarez, Fernando Gómez Materials (Basel) Article Spike anchors are one of the most promising techniques to prevent or delay debonding in FRP reinforcement sheets. There are several parameters affecting the anchors’ capacity, such as the embedment length and dowel angle. Regardless of the anchors’ capacity, their contribution to the overall strength of the anchored joint is affected by a larger number of variables, including the bonded length behind the anchors, the number and arrangement of the anchors, and the contact surface between the anchor fan and the FRP sheet. This paper presents experimental results of 10 tests conducted on concrete beams. In the tests, anchored joints reached peak loads up to 155% of those of unanchored, bonded joints. The main finding of the research is that the bond length in front of and behind the anchors affects both the peak load and the overall behaviour, with unbonded anchored joints exhibiting a poor behaviour and premature slippage of the anchor, without achieving its failure due to fibre rupture. MDPI 2022-12-24 /pmc/articles/PMC9821658/ /pubmed/36614504 http://dx.doi.org/10.3390/ma16010164 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Llauradó, Paula Villanueva
Porres, Rafael Cascón
Blázquez, Alberto Sanchidrián
Olalla, Francisco Santos
Álvarez, Fernando Gómez
Flexural Tests for Efficiency Evaluation of Spike Anchors on CFRP-Strengthened Concrete
title Flexural Tests for Efficiency Evaluation of Spike Anchors on CFRP-Strengthened Concrete
title_full Flexural Tests for Efficiency Evaluation of Spike Anchors on CFRP-Strengthened Concrete
title_fullStr Flexural Tests for Efficiency Evaluation of Spike Anchors on CFRP-Strengthened Concrete
title_full_unstemmed Flexural Tests for Efficiency Evaluation of Spike Anchors on CFRP-Strengthened Concrete
title_short Flexural Tests for Efficiency Evaluation of Spike Anchors on CFRP-Strengthened Concrete
title_sort flexural tests for efficiency evaluation of spike anchors on cfrp-strengthened concrete
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9821658/
https://www.ncbi.nlm.nih.gov/pubmed/36614504
http://dx.doi.org/10.3390/ma16010164
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