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从以前关于钢管钢筋混凝土柱的研究可以明确看出,钢管钢筋混凝土柱优于钢管混凝土柱。这主要是因为钢管和钢筋共同施加侧压于混凝土芯,从而改善了混凝土芯的性能。为了弄清混凝土芯约束性能的影响,并提出一个关于钢管钢筋混凝土柱轴心抗压强度的评估方程,使用参数研究法将数值结果与试验结果相匹配,从而对钢管钢筋混凝土柱进行数值分析。根据分析结果,对钢管钢筋混凝土中混凝土约束性能和钢管应力状态进行讨论。最后,提出一个和钢管钢筋混凝土柱荷载分担比例有关的﹑非常规的﹑评估约束性能的方程,并通过试验数据验证了钢管钢筋混凝土柱轴心抗压强度的评估方程。
From the previous studies on steel reinforced concrete columns it can be clearly seen that steel reinforced concrete columns are better than steel concrete columns. This is mainly due to the fact that the steel pipe and reinforcing bar exert lateral pressure on the concrete core, thus improving the performance of the concrete core. In order to find out the influence of the restraint property of concrete core and to propose an evaluation equation about the axial compressive strength of concrete filled steel tubular columns, the numerical results are matched with the experimental results by using the parametric study method, and the numerical analysis of the concrete filled steel tubular columns is carried out. Based on the analysis results, the confinement properties of concrete in steel tube reinforced concrete and the stress state of steel tube are discussed. Finally, an unconventional equation for evaluating the load-sharing ratio of steel-reinforced concrete (CFST) columns is proposed, and the evaluation equation of axial compressive strength of CFST columns is verified by the experimental data.