方钢管砼中长轴压柱稳定分析和实用设计方法

Stability Analysis and Calculation of Concrete Filled Square Steel Tubular Long and Intermediate Length Columns under Axial Lo(?)d

本文依据方钢管砼短柱的性能,参照素砼的基本材性和焊接方钢管的实测残余应力分布规律,详细分析并建立了方钢管砼构件中两种材料的σ-ε本构关系,并据此建立了方钢管砼轴压柱的切线模量理论临界荷载计算公式和压溃荷载计算方法。文中汇集了国内30根和国外11根试验柱资料,经分析对比,提出了方钢管砼中长轴压柱的实用稳定设计计算方法。

According to the experimen(?)al behaviour of concrete filled square steel tubular short columns, the basic behaviour of plain concrete and the regularity of the measured residual stress distribution, this paper has established the constitutive relationship between σ and e of square steel tube filled with concrete. Based on these, it further establishes the formulas for calculating the critical load by tangent modulus theory and the method for computing collapse load of axially loaded concrete filled square steel tubular columns. 41 test data at home and abroad have heen collected and analyzed in the paper. The comparison between the test and calculation results shows good agreement. Finally, the practical method for a-nalyzing stability of axially loaded long and intermediate length columns has also been presented.