Strengthening of Low-Strength Concrete Columns with Fibre Reinforced Polymers. Full-Scale Tests
Author(s): |
Sonia Martínez
Ana de Diego Viviana J. Castro Luis Echevarría Francisco J. Barroso Gabriel Rentero Rafael P. Soldado José Pedro Gutierrez |
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Medium: | journal article |
Language(s): | English |
Published in: | Infrastructures, November 2020, n. 11, v. 5 |
Page(s): | 91 |
DOI: | 10.3390/infrastructures5110091 |
Abstract: |
Confinement of columns with externally bonded fibre reinforced polymers (FRP) sheets is an easy and effective way of enhancing the load carrying and strain capacity of reinforced concrete (RC) columns. Many experimental studies have been conducted on cylindrical small-scale un-reinforced concrete specimens externally confined with FRP. It is widely accepted that confinement of square or rectangular columns is less efficient than the confinement of circular columns. The theoretical models for rectangular sections are mostly based on approaches for circular columns modified by a shape factor, but the different models do not give similar results. This paper presents an experimental program on large-scale square and rectangular RC columns externally strengthened with carbon FRP sheets and subjected to axial load. The main variables were the side-aspect ratio of the cross-section, the radius of curvature of the corners and the amount of FRP reinforcement. The results show that the FRP confinement can increase the strength and strain capacity of rectangular concrete columns with low strength concrete. The FRP hoop ultimate strain was much lower than the material ultimate tensile strain obtained from flat coupon tests and the strain efficiency factor achieved in the tests was less than the value usually recommended by design guides. |
Copyright: | © 2020 the Authors. Licensee MDPI, Basel, Switzerland. |
License: | This creative work has been published under the Creative Commons Attribution 4.0 International (CC-BY 4.0) license which allows copying, and redistribution as well as adaptation of the original work provided appropriate credit is given to the original author and the conditions of the license are met. |
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22/04/2023 - Last updated on:
10/05/2023