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提出CFRP-圆钢管自密实混凝土加固钢筋混凝土柱的复合加固方法。通过1根钢筋混凝土方形截面短柱和9根复合加固钢筋混凝土方形截面短柱的轴压试验,研究了CFRP-钢管自密实混凝土复合加固混凝土方形截面短柱的轴压性能,分析了CFRP层数、钢管壁厚对复合加固短柱的承载力、刚度和延性的影响。试验结果表明:随着CFRP层数的增大,复合加固柱的承载力和弹塑性阶段刚度显著提高;随着钢管壁厚的增大,复合加固柱刚度和延性显著提高;在其他条件相同的情况下,复合加固柱承载力的提高率将随钢管壁厚的增大而减小;当承载力提高幅度相同时,使用CFRP复合加固可以降低钢管壁厚,有效减少用钢量。在试验研究的基础上,建立了复合加固钢筋混凝土方形截面短柱的承载力计算公式,计算结果与试验结果吻合良好。
Proposed CFRP-round steel tube self-compacting reinforced concrete column consolidation method. The axial compressive properties of CFRP-steel self-compacting concrete-filled square columns with square cross-section were studied by means of axial compression tests on one short column of square reinforced concrete and 9 columns of square reinforced concrete under cyclic loading. , The influence of steel pipe wall thickness on the bearing capacity, stiffness and ductility of composite reinforced short columns. The experimental results show that with the increase of the number of CFRP layers, the bearing capacity and the elastic-plastic phase stiffness of the composite reinforced columns increase significantly. The stiffness and ductility of the composite reinforced columns increase significantly with the increase of the wall thickness. , The rate of increase of bearing capacity of composite reinforced columns will decrease with the increase of steel pipe wall thickness. When the bearing capacity increases by the same extent, the use of CFRP composite reinforcement can reduce the steel pipe wall thickness and reduce the amount of steel used. On the basis of the experimental study, the formula for calculating the bearing capacity of square columns with square columns reinforced by composite reinforcement is established. The calculated results are in good agreement with the experimental results.