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通过10根PVC-CFRP管钢筋混凝土短柱轴压试验,分析CFRP条带环箍间距和轴向配筋等因素对PVC-CFRP管钢筋混凝土短柱承载力、变形以及破坏形态的影响。试验研究表明:与无筋试件相比,配筋率为1.8%的配筋试件的承载力和轴向极限压应变分别提高约24%和16%;随着CFRP条带环箍间距的增大,配筋试件的承载力和轴向极限压应变逐渐减小;配筋试件破坏时,试件中部多条CFRP条带拉断并伴随纵向钢筋压屈。PVC-CFRP管钢筋混凝土的应力-应变关系曲线可以分为三段:第一段的应力-应变关系曲线为抛物线;第二段为曲线过渡段;第三段为强化段,配筋试件的应力和应变一直处于递增状态,与无筋试件相比,配筋试件强化段斜率较大。根据静力平衡条件和极限平衡条件,推导出PVC-FRP管混凝土柱承载力的计算式,计算结果与试验值吻合较好。
Through the axial compression test of 10 short columns of PVC-CFRP pipe reinforced concrete, the influence of the spacing of CFRP band hoops and axial reinforcement on the bearing capacity, deformation and failure mode of the short columns of PVC-CFRP pipe reinforced concrete short columns were analyzed. The experimental results show that the bearing capacity and axial ultimate compressive stress of reinforcement specimens with reinforcement ratio of 1.8% increase about 24% and 16% respectively compared with those without reinforcement. With the spacing of , The bearing capacity and axial ultimate compressive strain of the specimens decreased gradually. When the specimens were broken, a plurality of CFRP strips in the middle part of the specimen were pulled off and accompanied with longitudinal bar buckling. The stress-strain curve of PVC-CFRP pipe reinforced concrete can be divided into three sections: the stress-strain curve of the first section is a parabola; the second section is the curve transition section; the third section is the reinforced section, Stress and strain have been in an increasing state, compared with the non-reinforced test specimens, reinforcing steel specimen reinforcement section slope. According to the static equilibrium condition and the limit equilibrium condition, the calculation formula of the bearing capacity of PVC-FRP pipe concrete columns is deduced. The calculation results are in good agreement with the experimental values.