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Polymers 2015, 7(5), 851-875; doi:10.3390/polym7050851

Compressive Behavior of Concrete Confined with GFRP Tubes and Steel Spirals

1
College of Civil Engineering, Hunan University, Changsha 410082, China
2
Department of Organic and Wood-Based Construction Materials, Technical University of Braunschweig, Hopfengarten 20, Braunschweig 38102, Germany
3
Centre for Light and Environmentally-Friendly Structures, Fraunhofer Wilhelm-Klauditz-Institut WKI, Bienroder Weg 54E, Braunschweig 38108, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Alper Ilki and Masoud Motavalli
Received: 25 March 2015 / Revised: 23 April 2015 / Accepted: 27 April 2015 / Published: 30 April 2015

Abstract

This paper presents the experimental results and analytical modeling of the axial compressive behavior of concrete cylinders confined by both glass fiber-reinforced polymer (GFRP) tube and inner steel spiral reinforcement (SR). The concrete structure is termed as GFRP–SR confined concrete. The number of GFRP layers (1, 2, and 3 layers) and volumetric ratios of SR (1.5% and 3%) were the experimental variables. Test results indicate that both GFRP tube and SR confinement remarkably increase the ultimate compressive strength, energy dissipation capacity, and ductility of concrete. The volumetric ratio of SR has a more pronounced influence on the energy dissipation capacity of confined concrete with more GFRP layers. In addition, a stress–strain model is presented to predict the axial compressive behavior of GFRP–SR confined concrete. Comparisons between the analytical results obtained using the proposed model and experimental results are also presented. View Full-Text
Keywords: confinement; concrete; GFRP; composite materials; spiral; compressive stress–strain behavior; stress–strain model confinement; concrete; GFRP; composite materials; spiral; compressive stress–strain behavior; stress–strain model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Huang, L.; Sun, X.; Yan, L.; Zhu, D. Compressive Behavior of Concrete Confined with GFRP Tubes and Steel Spirals. Polymers 2015, 7, 851-875.

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