钢管钢筋混凝土柱的轴心抗压性能研究

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。

A Study on Axial Compressive Behaviors of Reinforced Concrete Filled Tubular Steel Columns

It is clear from former researches on reinforced concrete filled tubular steel (RCFT) columns that RCFT columns have better performance than concrete filled steel tubular (CFT) columns. The enhancements may be mainly due to the improvements in performance of the concrete core because of the confinement pressure imposed by both steel tube and reinforcement. To clarify the effect of confinement on concrete core and propose evaluation equation for axial compressive strength of RCFT columns, numerical analyses of RCFT columns are conducted by matching the numerical results with experimental results via parametric study. According to the results of the analyses, effect of confinement on concrete and effect of stress state on steel tube of RCFT columns are discussed, as a result, a non-conventional method for evaluating the confinement effect which is concerned with load-sharing ratio of RCFT columns is proposed, and the evaluation equation for axial compressive strength of RCFT columns is obtained and validated through the experimental data.