二次受力下碳纤维加固混凝土柱抗剪承载力分析

Analysis on Shear Bearing Capacity of RC Column Reinforced with CFRP Subjected to Secondary Load

采用碳纤维加固抗剪承载力不足的钢筋混凝土柱,由于有轴向力的存在,即存在二次受力问题。根据桁架-拱模型理论对碳纤维加固后的受力进行了分析,综合考虑截面尺寸、配箍率、碳纤维布的折算配箍率、混凝土的软化效应、拱作用等因素,推导出不同剪跨比情况下钢筋混凝土柱在二次受力情况下的抗剪承载力计算公式。通过理论公式计算以往的实验数据,并将理论计算结果、规范计算结果与试验结果进行对比分析。

Using the carbon fiber to reinforce the shear bearing capacity of reinforced concrete column,the axial compression is existed（ known as the secondary load）. Based on the truss arch model theory,the stress of carbon fiber reinforcement is analyzed,the section size,reinforcement ratio,CFRP reinforcement of conversion rate,the softening effect of concrete,arch effect and other factors are considered comprehensively,and the shear bearing capacity formula of reinforced concrete column subjected to the secondary load under different shear span ratio is deduced. Through theoretical calculation of the previous experimental data,the results of theoretical calculation,standard calculation and the experiment are compared.