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通过12组72件喷射纤维/树脂复合材料(FRP)试样的拉伸强度试验,研究了纤维种类、树脂基体材料、纤维体积分数、纤维混杂比及纤维长度等因素对喷射FRP拉伸强度、弹性模量和断裂伸长率等性能的影响。通过8根钢筋混凝土(RC)柱试件的拟静力试验,研究了喷射玄武岩纤维/树脂复合材料(BFRP)和混杂玄武岩-碳纤维/树脂复合材料(BF-CFRP)加固震损RC柱的抗震性能,分析了喷射FRP层厚度、纤维混杂比、柱预损程度和柱轴压比等对加固试件的极限承载力、抗侧变形能力、刚度退化特征和滞回特性的影响。结果表明:玻璃纤维与乙烯基酯树脂基体的协同工作性能最优,而玄武岩纤维具有耐久性高、延性好、与乙烯基酯树脂基体协同工作性能好等优良性能,可以作为玻璃纤维的良好替代品;玄武岩纤维混杂少量比例的碳纤维作为树脂基体增强材料,可以有效提高喷射FRP的拉伸强度和变形性能;震损RC柱经喷射FRP加固后,可以基本恢复其震损前设计极限承载力,并有效提高其延性和耗能能力。该加固方法可以对地震区已震损RC柱进行快速加固,有效防止整体结构在余震中发生倒塌等严重破坏。
Through the tensile test of 12 groups of 72 injection FRP specimens, the effects of fiber type, resin matrix, fiber volume fraction, fiber mixing ratio and fiber length on the tensile strength, Elastic modulus and elongation at break and other properties. Quasi-static tests of eight reinforced concrete (RC) column specimens were carried out to study the seismic response of reinforced RC columns strengthened with sprayed basalt fiber / resin composite (BFRP) and hybrid basalt-carbon fiber / resin composite The effects of spray FRP layer thickness, fiber mixing ratio, column pre-damage degree and column axial pressure ratio on the ultimate bearing capacity, lateral deformation resistance, stiffness degradation and hysteretic characteristics of the strengthened specimens were analyzed. The results show that glass fiber and vinyl ester resin matrix work best, while basalt fiber has excellent properties of high durability, good ductility and good interoperability with vinyl ester resin matrix, which can be used as a good alternative to glass fiber ; Basalt fiber mixed with a small proportion of carbon fiber as a matrix reinforcement material can effectively improve the spray FRP tensile strength and deformation properties of the damaged RC column spray FRP reinforcement can be basically restored its pre-shock design ultimate bearing capacity, And effectively improve its ductility and energy consumption. The reinforcement method can rapidly reinforce the RC columns that have been damaged in the earthquake area and effectively prevent the whole structure from being seriously damaged, such as collapsing during aftershocks.