冻融循环后GFRP管约束钢筋混凝土柱轴压性能试验研究OA

To explore the axial compressive behavior of reinforced concrete columns confined by fiber-wrapped glass fiber reinforced polymer(GFRP)tubes,axial compressive tests and finite element simulations were conducted on eight GFRP-confined reinforced concrete cylinders subjected to freeze-thaw cycles.The effects of concrete strength,number of freeze-thaw cycles,and slenderness ratio on the axial compression performance of the composite columns were studied.The results indicate that,under the same number of freeze-thaw cycles,the ultimate bearing capacity of the C60 columns is on average 9%higher than that of the C30 columns.The bearing capacity of the specimens decreases with the increase in freeze-thaw cycles,but the degradation rate is slower for the C60 columns than for the C30 columns.Additionally,the influence of slenderness ratio on the stiffness and bearing capacity of the speci-mens becomes more significant as the number of freeze-thaw cycles increases.A theoretical formula for calculating the axial compressive bearing capacity of GFRP-confined reinforced concrete columns was established,and the cal-culated results show a high degree of agreement with the experimental data.This study provides a valuable reference for related engineering designs.