薄壁偏压焊接方管柱整体—局部稳定相互作用问题的研究

Interactions Between Local and Overall Stability of Eccentrically Loaded Thin-Walled Box Columns

In this paper the curved shell finite element method is adopted to analyse the in-plane ultimate moment of simply supported plates and the interaction curves P/Py-M/Mp of thin walled sections and columns. All initial imperfections are taken into account. The errors of the specifications in calculating the interactions between local and overall stability of thin-walled columns are checked. An approximate equation for calculating the ultimate moment of a thin-walled box section is proposed according to the theoretically computed results, a simple interaction equation is presented for calculating the ultimate strength of the eccentrically loaded sections and finally an effective design method of the eccentrically loaded columns is suggested. The results of the suggested method are in good agreement with those of the finite element method.