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Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods

The results of an experimental program on shear-strengthening of flat slabs using Glass Fiber Reinforced Polymer (GFRP) rods are presented. A total of seven specimens were tested under an upward concentric monotonic loading until failure. One specimen served as a control and was tested without any m...

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Autores principales: Yooprasertchai, Ekkachai, Dithaem, Ratchanon, Arnamwong, Titi, Sahamitmongkol, Raktipong, Jadekittichoke, Jira, Joyklad, Panuwat, Hussain, Qudeer
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8309495/
https://www.ncbi.nlm.nih.gov/pubmed/34301126
http://dx.doi.org/10.3390/polym13142369
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author Yooprasertchai, Ekkachai
Dithaem, Ratchanon
Arnamwong, Titi
Sahamitmongkol, Raktipong
Jadekittichoke, Jira
Joyklad, Panuwat
Hussain, Qudeer
author_facet Yooprasertchai, Ekkachai
Dithaem, Ratchanon
Arnamwong, Titi
Sahamitmongkol, Raktipong
Jadekittichoke, Jira
Joyklad, Panuwat
Hussain, Qudeer
author_sort Yooprasertchai, Ekkachai
collection PubMed
description The results of an experimental program on shear-strengthening of flat slabs using Glass Fiber Reinforced Polymer (GFRP) rods are presented. A total of seven specimens were tested under an upward concentric monotonic loading until failure. One specimen served as a control and was tested without any modification. The remaining six specimens were strengthened with post-installed GFRP rods in single (SG), double (DB), and radial (RD) patterns within shear critical parameters around the centric column. The results of this experimental study suggest that GFRP rods are capable of enhancing both the peak load and deformation capacity. Furthermore, brittle failure associated with punching shear failure was successfully avoided by all strengthening patterns. Of all of the patterns, the RD pattern resulted in maximum peak load increase and corresponding deformation capacity while the lowest bound was created by the SG pattern. The results suggested that SG, DB and RD patterns enhanced ultimate loads up to 9.1, 11.3 and 15.7% while corresponding deflections increased up to 109, 136 and 154%. Strain measurement on flexural reinforcement suggested that all strengthened specimens were able to withstand higher longitudinal strains than yield. It was further shown that reducing the spacing between the GFRP rods efficiently enhanced peak loads, nevertheless, neither this change was proportional, nor did it result in an enhanced energy dissipation capacity. In the end, recommendations of American Concrete Institute (ACI) for the shear strength of two-way systems were modified to incorporate the contributions from GFRP rods. The results indicate that the proposed analytical approach provides an excellent match with the experimental results.
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spelling pubmed-83094952021-07-25 Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods Yooprasertchai, Ekkachai Dithaem, Ratchanon Arnamwong, Titi Sahamitmongkol, Raktipong Jadekittichoke, Jira Joyklad, Panuwat Hussain, Qudeer Polymers (Basel) Article The results of an experimental program on shear-strengthening of flat slabs using Glass Fiber Reinforced Polymer (GFRP) rods are presented. A total of seven specimens were tested under an upward concentric monotonic loading until failure. One specimen served as a control and was tested without any modification. The remaining six specimens were strengthened with post-installed GFRP rods in single (SG), double (DB), and radial (RD) patterns within shear critical parameters around the centric column. The results of this experimental study suggest that GFRP rods are capable of enhancing both the peak load and deformation capacity. Furthermore, brittle failure associated with punching shear failure was successfully avoided by all strengthening patterns. Of all of the patterns, the RD pattern resulted in maximum peak load increase and corresponding deformation capacity while the lowest bound was created by the SG pattern. The results suggested that SG, DB and RD patterns enhanced ultimate loads up to 9.1, 11.3 and 15.7% while corresponding deflections increased up to 109, 136 and 154%. Strain measurement on flexural reinforcement suggested that all strengthened specimens were able to withstand higher longitudinal strains than yield. It was further shown that reducing the spacing between the GFRP rods efficiently enhanced peak loads, nevertheless, neither this change was proportional, nor did it result in an enhanced energy dissipation capacity. In the end, recommendations of American Concrete Institute (ACI) for the shear strength of two-way systems were modified to incorporate the contributions from GFRP rods. The results indicate that the proposed analytical approach provides an excellent match with the experimental results. MDPI 2021-07-19 /pmc/articles/PMC8309495/ /pubmed/34301126 http://dx.doi.org/10.3390/polym13142369 Text en © 2021 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
Yooprasertchai, Ekkachai
Dithaem, Ratchanon
Arnamwong, Titi
Sahamitmongkol, Raktipong
Jadekittichoke, Jira
Joyklad, Panuwat
Hussain, Qudeer
Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods
title Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods
title_full Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods
title_fullStr Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods
title_full_unstemmed Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods
title_short Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods
title_sort remediation of punching shear failure using glass fiber reinforced polymer (gfrp) rods
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8309495/
https://www.ncbi.nlm.nih.gov/pubmed/34301126
http://dx.doi.org/10.3390/polym13142369
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