Abstract
The test results on the performance of carbon fiber-reinforced polymer (CFRP)-confined reinforced concrete (RC) columns under axial compression load are presented in this study. Twelve slender CFRP-confined circular RC columns with a diameter of 200 mm were divided into two groups. Six specimens with different slenderness ratios of 12, 20, 32, 40, 48, and 56 were contained in each group. The experimental results demonstrated the circumferential CFRP wrap was effective in enhancing the ultimate axial load of slender CFRP-confined circular RC columns compared with unwrapped RC columns. The experimental investigation also showed that the slenderness of the specimens had important influences on the axial compressive behavior, and the axial bearing capacity of slender CFRP-confined circular RC columns decreased as the slenderness ratio increased. In order to predict the load-carrying capacities of slender CFRP-confined circular RC columns, a formula was proposed and the prediction agreed with the experiments. The slenderness of slender CFRP-confined circular RC columns was recommended to be less than 26.5 in practical engineering.
Highlights
Many slender reinforced concrete (RC) columns exist in actual concrete structures
One solution method is possible using carbon fiber-reinforced polymer (CFRP) jackets to confine them, but the columns are sensitive to buckling instability as the slenderness ratio increases [1]
The results indicated that the load-carrying capacity of columns slightly decreases as the slenderness increases [5]
Summary
Many slender reinforced concrete (RC) columns exist in actual concrete structures. These columns must be strengthened because of function changes and increasing loads. One solution method is possible using carbon fiber-reinforced polymer (CFRP) jackets to confine them, but the columns are sensitive to buckling instability as the slenderness ratio increases [1]. Column slenderness has a substantial influence on the confinement action of slender columns, and this effect must be considered in the design
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