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为大幅度提高加固效率,提出用钢筋钢丝网砂浆加固混凝土圆柱的思路。分别用钢筋钢丝网(SW)、钢筋网(S)、单一纤维复合材料(FRP)和混杂纤维复合材料(HFRP)加固混凝土圆柱共36根,进行轴压对比试验,探讨不同加固方法对试件承载能力和延性的影响。结果显示:SW加固柱保护层砂浆剥落与内部核心混凝土破坏几乎同时发生;且保护层砂浆裂缝间距基本与钢丝网格间距相等(11mm左右),因而裂缝又多又密;故SW加固柱与S加固柱相比,在承载力提高30%的前提下,延性仍达S加固柱的2倍左右。FRP或HFRP加固柱的承载力提高幅度最大,但两种加固柱的延性和变形能力明显低于SW加固柱。该文给出了SW加固混凝土圆柱的极限承载力计算公式。
In order to greatly enhance the reinforcement efficiency, put forward the idea of using reinforced steel mesh reinforced concrete column. Thirty-six reinforced concrete columns were reinforced with steel mesh (SW), steel mesh (S), single fiber composite (FRP) and hybrid fiber composite (HFRP) respectively, and axial compression tests were carried out to investigate the effects of different reinforcement methods on the specimens Bearing capacity and ductility. The results show that the mortar spalling of the protective column of SW reinforcement occurs almost simultaneously with the failure of the internal core concrete. The spacing of mortar cracks in the protective layer is almost equal to that of the steel mesh (about 11 mm) Compared with reinforced columns, under the premise of a 30% increase of bearing capacity, the ductility still reaches about 2 times of that of S reinforced columns. The load-carrying capacity of FRP or HFRP reinforced columns is the highest, but the ductility and deformation capacity of the two kinds of reinforced columns are obviously lower than those of SW reinforced columns. This paper gives the formula for calculating the ultimate bearing capacity of SW reinforced concrete columns.