双圆中空夹层钢管轻骨料混凝土中长柱受力分析

摘要

Based on the finite element analysis of lightweight concrete filled double round skin short column, this paper aims at studying the mechanical property of lightweight aggregate concrete filled double-skin steel tubular middle long column by establishing the model of middle-long column with ANSYS to carry out the stress calculation and result analysis. According to the main factors that influence the mechanical properties of the medium-long column and the existing calculation formula, the formula for calculating ultimate bearing capacity is corrected. The results of the modified formula are coincident with ANSYS. By analyzing the main factors concerned when the formula is corrected, the results are as follows: the ultimate load and ductility decreases with the increase of slenderness ratio; ductility decreases with decrease of concrete strength, but it has little influence on the ultimate load.%在圆中空夹层钢管轻骨料混凝土短柱的有限元分析基础上,应用ANSYS有限元软件建立中长柱模型进行受力计算与结果分析.结合钢管混凝土中长柱受力性能的主要影响因素及现有计算公式,对其极限承载力计算公式进行修正.修正后的公式计算结果与ANSYS有限元的计算结果吻合度较高.随中长柱长细比增大极限承载力降低,延性下降;随混凝土强度提高,中长柱延性降低,但对极限承载力的影响较小.