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通过21根圆形截面玄武岩纤维(BFRP)-箍筋复合约束混凝土柱的轴压试验,研究玄武岩纤维层数、箍筋的间距对约束混凝土柱的轴压性能影响。试验结果表明,玄武岩纤维-箍筋复合约束混凝土的轴压性能明显优于单一材料(玄武岩纤维或箍筋)约束的混凝土,随着玄武岩纤维层数的增加以及箍筋间距的减小,玄武岩纤维-箍筋复合约束混凝土试件的承载能力和变形能力有效提高。玄武岩纤维-箍筋复合混凝土试件的应力-应变曲线可分为弹性阶段、过渡阶段、强化阶段及残余阶段4个阶段。基于本文及相关文献的试验研究结果,提出纤维-箍筋复合混凝土圆柱的承载能力计算模型,对比表明该模型与试件结果吻合较好。
The axial compression tests of 21 concrete columns with circular cross-section of basalt fiber (BFRP) and stirrups were carried out to study the influence of the basalt fiber layers and the stirrup spacing on the axial compression properties of confined concrete columns. The experimental results show that the axial compressive properties of the basalt fiber-stirrups composite confined concrete are obviously better than that of the single material (basalt fiber or stirrups). With the increase of basalt fiber layers and the decrease of stirrup spacing, basalt fiber The Load Capacity and Deformation Capacity of Concrete Confined by Stirrups Confinedly Increased Effectively. The stress-strain curves of basalt fiber-stirrups composite concrete specimens can be divided into four stages: elastic stage, transition stage, strengthening stage and residual stage. Based on the experimental results of this paper and related literatures, the calculation model of the bearing capacity of fiber-stirruss composite concrete columns is proposed. The comparison shows that the model is in good agreement with the test results.