2025/07/21 by Brhanu Degefa Zewdu, Temesgen Wondimu Aure
paper · doi:10.20372/nadre:10622
Recently, Fiber Reinforced Polymer (FRP) materials have emerged as a viable alternative to con2ned columns due to their high ultimate tensile strength to weight ratio and corrosion resistance under harsh and corrosive environments. Many previous studies were focused on the con2ning capability of FRP on concentric axial loads. +is study presents a nonlinear 2nite element (FE) investigation of the e4ects of the thickness of Carbon Fiber Reinforced Polymer (CFRP), the thickness of steel tube, cross-sectional shape, and slenderness e4ect of an FRP con2ned concrete-2lled steel tube (FCCFST) column under eccentric load. +e FE model was validated by comparing the results with experimental data available in the literature, and good agreement was found. From the FE results, it was found that the steel tube and CFRP con2nement improved the load resistance capacity by about 34% to 39%, and the axial shortening of the column at the peak load, from 136% to 57%, in rectangular and circular cross-sections, respectively. +e e=ciencies of steel tube and CFRP con2nement 2rst increase with an increasing eccentricity of the axial load and then start to decrease as the failure mode of the column changes to stability.<br>