内(圆)钢管增强方钢管混凝土偏压柱极限承载力分析数值方法

根据数值积分方法对内（圆）钢管增强的方钢管混凝土偏压弯过程进行了数值模拟,并对其极限承载力进行了计算,在大量试算的基础上,分析了含钢率,偏心距和长细比等因素对极限承载力的影响,最后,将所计算的内（圆）钢管增强的方钢混凝土偏压柱极限承载力的结果与已有的纯方钢管混凝土偏压柱的试验结果进行了对比,表明内（圆）钢管增强效果明显。

Numerical method for analysis of ultimate strength of concrete-filled square steel tubular columns under eccentric compression reinforced by inner circular steel tube

The numerical simulation of the compression and bending of the concrete filled square steel tubular columns under the eccentric compression reinforced by the inner circular steel tube in the method of numerical integration is presented in this paper, and the calculation of the ultimate strength of the columns under the eccentric compression is also completed. Based on the results of a lot of trial computations, the effects of several parameters, such as t 1/D 1 , eccentricity and slenderness ratio etc., on the ultimate strength of the columns are studied. At the end of this paper, the comparison of the calculation results of the ultimate strength of the concrete filled square steel tubular columns reinforced by the inner circular steel tube under eccentric compression with the experimental results of the concrete filled square steel tubular columns without inner circular steel tube is completed, which shows that the inner circular steel tube is efficient in improving the performance of the columns.