BS700高强钢槽形对焊箱形截面构件稳定性的影响因素

为研究BS700高强钢槽形对焊箱形截面构件稳定性的影响因素,建立了能考虑初始几何缺陷和残余应力的非线性屈曲分析有限元模型,研究了残余应力、翼缘宽厚比、长细比等因素对构件稳定性的影响.研究发现,残余应力对长细比位于20～70的构件稳定系数有显著影响,翼缘宽厚比对构件稳定性有较大影响.随着翼缘宽厚比增加,构件屈曲模式由整体...

Factors Influencing Stability of BS700 High-strength Steel Box Section Column Fabricated by Welding Channel Sections

To study the influence factors of the stability of BS700 high-strength steel box section columns fabricated by welding channel sections, the nonlinear buckling analysis finite element model was established which took geometric deflection and residual stress into consideration. This paper studied the influence factors of the residual stress, width-thickness ratio of flange and slenderness ratio on the stability of the columns. The study reveals that the residual stress has a significant influence on the stability of columns with slenderness ratio between 20 and 70. The flange width-thickness ratio also greatly influences the stability of columns. With the increase of flange width-thickness ratio, the buckling mode of columns gradually changes from overall buckling to local buckling. When the width-thickness ratio is less than 30, the residual stress has a great influence on the stability of columns, with the maximum exceeding 10%. When width-thickness ratio is more than 40, the residual stress has little influence. Columns with medium slenderness ratio are more sensitive to residual stress. The slenderness ratio has an important influence on the stability of columns. With the increase of slenderness ratio, the stability factor of all columns decreases. However, the influence of slenderness ratio on the stability of columns varies with the flange width-thickness ratio and section side ratio, while there is little influence on the stability of columns with compact section(with small flange width thickness ratio and section side ratio).