Abstract
The present study deals with the analysis of experimental results, in terms of load carrying capacity and strains, obtained from tests on reinforced concrete (RC) columns, strengthened with external carbon fiber reinforced polymer (CFRP) sheets. The experimental parameters include: number of wrap layers, slenderness of the columns (L/a or L/D) and shape of the section (circular and square). A total of 48 specimens were subjected to axial compression. All test specimens were loaded to failure in axial compression. Compressive stress, axial and hoop strains have been recorded to evaluate the stress-strain relationship, ultimate strength, stiffness, and ductility of the specimens. Results clearly demonstrate that composite wrapping can enhance the structural performance of RC columns in terms of both maximum strength and ductility. The effects of test parameters are evidenced and compared.
Highlights
During the last decade, the use of FRP composites has been successfully promoted for external confinement of reinforced concrete (RC) columns all over the world
This study presents a comprehensive experimental investigation on the behavior of axially loaded circular and square reinforced columns strengthened with carbon fiber reinforced polymer (CFRP) wrap
The first zone is essentially a linear response governed by the stiffness of the unconfined concrete, which indicates that no confinement is activated in the CFRP wraps since the lateral strains in the concrete are very small
Summary
The use of FRP composites has been successfully promoted for external confinement of reinforced concrete (RC) columns all over the world. More research investigation is needed on this subject to study the effect of slenderness of concrete columns with higher strength. This study presents a comprehensive experimental investigation on the behavior of axially loaded circular and square reinforced columns strengthened with CFRP wrap. Representative stress-strain curves for each series of tested CFRP-wrapped specimens are reported in Figure 3 for circular specimens and in Figure 4 for square specimens. These figures give the axial stress versus the axial and lateral strains for specimens with zero, 1 and 3 layers of CFRP wrap considering various slenderness ratios. Indicates that the concrete core is significantly damaged (but yet confined) even before reaching ultimate load
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