. Results of the experimental study indicate that the influence of prestress on compressive strength is significant, with an increase in
ultimate strength observed in all prestressed specimens compared to that of nonprestressed specimens. On the other hand, the influence of
prestress on axial strain was found to be dependent on the amount of confinement, with lightly-confined and well-confined prestressed
specimens displaying a decrease and increase in ultimate strain respectively, compared to their nonprestressed counterparts. The results
also indicate that prestressing the AFRP shell prevents the sudden drop in strength, typically observed in FRP-confined HSC specimens,
that initiates at the transition point that connects the first and second branches of the stress-strain curves. Finally, it was observed that prestressing
the AFRP tube results in a significant increase in the specimen toughness as well as in the hoop strain efficiency of the AFRP shell.
. Results of the experimental study indicate that the influence of prestress on compressive strength is significant, with an increase inultimate strength observed in all prestressed specimens compared to that of nonprestressed specimens. On the other hand, the influence ofprestress on axial strain was found to be dependent on the amount of confinement, with lightly-confined and well-confined prestressedspecimens displaying a decrease and increase in ultimate strain respectively, compared to their nonprestressed counterparts. The resultsalso indicate that prestressing the AFRP shell prevents the sudden drop in strength, typically observed in FRP-confined HSC specimens,that initiates at the transition point that connects the first and second branches of the stress-strain curves. Finally, it was observed that prestressingthe AFRP tube results in a significant increase in the specimen toughness as well as in the hoop strain efficiency of the AFRP shell.
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