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.
Highlights
In the last two decades, the use of fiber-reinforced polymer (FRP) composites has drawn much attention in civil engineering
The failure process was quiet because of a relatively gradual rupture of the glass FRP (GFRP) tube, unlike the explosive process observed in carbon FRP (CFRP) confined concrete cylinders
Significant increase in strength and ductility of concrete can be achieved by using GFRP tubes and spiral reinforcement (SR)
Summary
In the last two decades, the use of fiber-reinforced polymer (FRP) composites has drawn much attention in civil engineering. Research efforts have been directed towards the applications of FRP in new column constructions; concrete-filled FRP tubes (CFFTs) have been used as high-performance composite columns in construction of earthquake-resistant structures [19,20,21,22,23,24,25,26,27,28,29]. These studies showed that the stress–strain curve of well-confined concrete with FRP is characterized by two ascending branches with increasing ultimate concrete compressive strength and strain. Based on the experimental results, a design-oriented confinement stress–strain model was developed
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