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通过对2根采用不同粘结剂的碳纤维加固钢筋混凝土柱和1根未加固的钢筋混凝土柱进行的标准火灾试验,对比了各柱的破坏形态、截面温度场、轴向变形以及耐火极限。结果表明:有机胶粘贴碳纤维布所形成的约束在受火几分钟后就会失去约束作用,而无机胶粘贴碳纤维布所形成的约束在受火几十分钟后仍然可以为核芯混凝土提供良好的侧压力;无机胶粘贴碳纤维布加固的混凝土柱耐火性能较好,其耐火极限较有机胶粘贴碳纤维布加固的混凝土柱提高了53.3%,且与相同荷载比条件下的未加固柱的耐火极限相当。
Through the standard fire test of two reinforced concrete columns and one unreinforced reinforced concrete column with different binders, the failure modes, cross-section temperature field, axial deformation and fire resistance of each column are compared. The results show that the constraints formed by the organic adhesive carbon fiber cloth will lose the restraint effect after being exposed to the fire for a few minutes, while the constraint formed by the inorganic adhesive carbon fiber cloth can still provide the core concrete after being exposed to fire for tens of minutes Good lateral pressure; reinforced concrete columns reinforced with inorganic adhesive bonded carbon fiber cloth have better fire resistance, the fire resistance is increased by 53.3% compared with the reinforced concrete columns with organic adhesive bonded carbon fiber cloth, and the unreinforced columns with the same load ratio The fire resistance equivalent.