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Abstract

The present contribution aims at highlighting the behavior of square-section and cylindrical specimens confined by carbon fiber reinforced polymer fabrics. For this purpose, 48 cylindrical concrete moulds of 110 × 220 mm² dimensions and 24 prismatic concrete moulds of 100 × 100 × 200 mm³ dimensions were tested for uniaxial failure under compression. The forms of rupture observed are all similar, no matter the shape of the section of the test-specimen (circular or square). Without confinement, a superiority of 14% in terms of compressive strength is confirmed for the square-section specimen in comparison with the circular-section specimens. With confinement, we observe a very significant advantage of circular-section specimens compared to square-section specimens. The performance of an fiber-reinforced polymer confinement is, however, largely better for a cylindrical specimen comparing to the prismatic specimen. With a rate of confinement of 1 and 3 layers, the compressive strength is increased, respectively, by 58% and 236% for the cylindrical test-specimen and by 20% and 95% for the square specimen. Moreover, the concrete shows an additional deformability proportionally to the confinement rate. The stress-strain curves obtained showed a tri-linear behavior; the first and the second part of the curve depend on the resistance of the non-confined concrete, whereas the third part was directly dependent on the confinement rate and its stiffness. Extension of analytical modeling of Wu et al. (Wu, G., Wu, Z.S., Lu, Z.T. and Ando, Y.B. (2008). Structural Performance of Concrete Confined with Hybrid RP Composite, Journal of Reinforced Plastics and Composites, 27(12): 1323-1348) is proposed to take into account the effect of geometry.

Keywords

carbon fiber reinforced concrete confinement geometrical effect.

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Geometrical Effect on the Behavior of CFRP Confined and Unconfined Concrete Columns

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