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通过碳纤维布(CFRP)和玻璃纤维布(GFRP)条带间隔粘贴加固钢筋混凝土圆柱在冻融循环作用下的轴心受压试验,分析冻融循环、纤维布类型对钢筋混凝土圆柱轴压性能的影响。结果表明,经过冻融循环作用之后,FRP条带加固钢筋混凝土圆柱的强度、刚度和延性均降低。在相同条件下,CFRP条带加固柱的强度与延性大于GFRP条带加固柱。引入混凝土强度、FRP强度退化模型,建立冻融循环环境下FRP条带加固钢筋混凝土圆柱的正截面受压承载力计算模型。
The axial compressive strength test of reinforced concrete columns under the action of freeze-thaw cycles was conducted through the CFRP and GFRP strips. The effects of freeze-thaw cycles, the type of fiber cloth on the axial compressive properties of reinforced concrete columns influences. The results show that after the freeze-thaw cycles, the strength, stiffness and ductility of the reinforced concrete columns strengthened with FRP strips decrease. Under the same conditions, the strength and ductility of CFRP strip reinforcement columns is greater than that of GFRP strip reinforcement columns. The concrete strength and FRP strength degradation model are introduced to establish the normal cross-section compressive bearing capacity model of reinforced concrete columns strengthened by FRP strips under freezing-thawing cycles.