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This study investigates the impact of column height on failure mechanisms and seismic performance of Glass Fiber Reinforced Polymer (GFRP) and steel-reinforced concrete columns actively confined with Aramid fiber tapes. Six large-scale slender columns were tested under constant axial and cyclic lateral loading, including reference and confined specimens with 10 % and 30 % confinement. Results indicate that active confinement with Aramid fiber tapes increases shear capacity, ultimate lateral displacement, alters crack propagation, and shifts failure locations. The hysteresis curves of confined specimens become more pronounced compared to reference specimens for both steel- and GFRP-reinforced columns. Damage index evaluations show that confinement slows damage progression in all samples, regardless of reinforcement type and column height, with higher confinement ratios having a noticeable effect. The 1400 mm-high steel- and GFRP-reinforced columns with 30 % confinement exhibited cumulative dissipated energy ratios 2.38 and 2.19 times higher, respectively, than their unconfined counterparts. In contrast, the 1000 mm-high columns showed ratios of 1.96 and 3.27 times, respectively, indicating that confinement efficiency in enhancing cumulative energy dissipation decreased with increasing column height in GFRP-reinforced specimens.
Ebrahimzadeh et al. (Thu,) studied this question.