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为了研究圆形钢套管加固钢筋混凝土柱的基本力学性能,对1根未加固的普通钢筋混凝土短柱和4根圆形钢套管加固钢筋混凝土短柱,进行了在不同加固钢套管厚度以及初始轴压比下的轴心受压试验,初始轴压力通过对未加固构件施加后张预应力来进行模拟。在试验研究的基础上,根据叠加法与极限平衡法建立了圆形钢套管加固钢筋混凝土短柱的轴压承载力公式。研究结果表明:加固构件的承载力与延性均比未加固构件大大提高;同时随着钢套管厚度的增加,加固构件的承载力不断增大,而构件的延性却变化不大,初始轴压力对加固构件的承载力影响微小。利用2种方法计算的加固短柱承载力与试验结果吻合均较好,但是叠加法更为简单,计算结果更准确。
In order to study the basic mechanical properties of circular steel tube reinforced concrete columns, a reinforced concrete short column was reinforced with one reinforced concrete short column and four circular steel tubes, And the axial compression test at initial axial compression ratio, the initial axial compression was simulated by applying post-tensioning prestress to the unreinforced member. Based on the experimental study, the formula of axial compressive bearing capacity of reinforced concrete short columns strengthened by circular steel tubes was established based on the superposition method and the limit equilibrium method. The results show that the bearing capacity and ductility of the reinforced members are much higher than those of the un-reinforced members. Meanwhile, with the increase of the thickness of the steel casing, the bearing capacity of the reinforced members increases, but the ductility of the members does not change much. The initial axial pressure The reinforcement of the bearing capacity of small impact. The calculated results of the two methods agree well with the experimental results, but the superposition method is simpler and the calculation results are more accurate.