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为研究圆形玄武岩纤维(BFRP)-钢复合管混凝土短柱的轴向受压性能,对12个圆截面短柱进行试验。试验研究结果表明:由于受到外部BFRP的约束,内部钢管的局部屈曲得到了有效抑制,BFRP-圆钢管混凝土短柱的荷载-纵向应变由弹性阶段、屈服阶段、强化阶段及残余阶段4部分组成,其强化阶段的刚度随着BFRP层数的增加而增加,增加BFRP的层数,BFRP-圆钢管混凝土短柱表现出更大的峰值荷载和轴向峰值应变,基于分项叠加的理念,提出了纤维增强复合材料FRP-圆钢管混凝土短柱的轴压承载力计算方法,计算式反映了钢管厚度、FRP厚度的参数影响趋势,与试验结果吻合较好。
In order to investigate the axial compressive properties of BFRP-steel composite concrete short columns, 12 circular short columns were tested. The experimental results show that the local buckling of the inner steel pipe is restrained effectively due to the external BFRP. The load-longitudinal strain of the short steel-reinforced concrete filled steel tubular column is composed of four parts: elastic stage, yielding stage, strengthening stage and residual stage. The stiffness of the reinforcement phase increases with the increase of the number of BFRP layers. Increasing the number of layers of BFRP, BFRP-CFST short columns show greater peak load and axial peak strain. Based on the concept of partial superposition, Calculation method of axial compressive bearing capacity of FRP-CFST stub columns filled with fiber reinforced composites. The calculation formula reflects the influence trend of parameters of steel pipe thickness and FRP thickness, which is in good agreement with the test results.