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以试件的直径、径厚比和混凝土强度等级为试验参数进行了19根试件的轴心抗压试验,考察了钢管聚丙烯纤维超高强石渣混凝土短柱轴心受压时的破坏形态,揭示了影响其力学性能的因素和规律.试验结果表明:钢管内填充低碳聚丙烯纤维超高强石渣混凝土可以解决由于自收缩偏大引起的钢管混凝土脱空问题;在试验参数范围内,影响试件静力特性的主要因素是套箍指标和核心混凝土强度;荷载-平均应变关系曲线可以分为4个阶段,即弹性阶段、弹塑性阶段、承载力下降阶段和承载力回升阶段;所有试件都呈剪切型的破坏特征,残余承载力达到极限荷载的80%以上,都有较好的延性性能,极限应变达到8.67%～24.9%;最后,推荐了经回归分析得到的钢管聚丙烯纤维超高强石渣混凝土短柱轴心受压极限承载力的计算公式,计算结果与试验数据比较吻合.
The axial compression tests of 19 specimens were carried out with the test specimen diameter, diameter-to-thickness ratio and concrete strength grade as the test parameters. The failure morphology of CFRP super-high strength stone slag concrete short columns under axial compression was investigated. It reveals the factors and laws affecting its mechanical properties. The test results show that the filling of steel tubes with low-carbon polypropylene fiber ultra-high strength stone slag concrete can solve the problem of the degassing of concrete-filled steel tubes caused by excessive self-shrinkage; within the scope of the test parameters, The main factors affecting the static characteristics of the specimen are the hoop index and the strength of the core concrete; the load-average strain curve can be divided into four stages, namely the elastic stage, the elastoplastic stage, the load-carrying stage and the bearing capacity recovery stage; all The specimens are all shear-type failure characteristics. The residual bearing capacity reaches over 80% of the ultimate load, and has good ductility. The ultimate strain reaches 8.67% to 24.9%. Finally, the steel pipe obtained by regression analysis is recommended. The calculation formula of the ultimate bearing capacity of the short axis of acrylic fiber super-high strength stone slag concrete columns is calculated. The calculated results are in good agreement with the experimental data.