不同孔径金属腹板稳定性及补强措施分析

Analysis on Stability and Reinforcement Measures of Metal Web With Different Diameters

针对金属腹板在不同开孔直径下的剪切稳定性,采用有限元弹性屈曲分析方法进行研究。并为补偿开孔后稳定性的损失,探讨了常用的加强环、法兰的加强方式在不同开孔尺寸下的加强效果。结果表明:金属腹板的稳定性随开孔直径的增加呈下降趋势,增加法兰翻边高度和厚度提高腹板稳定性的效果明显,当翻边高16 mm,法兰厚度1.5 mm时补强效果最好。这是由于增加法兰翻边高度和厚度相当于提高了开孔周边的刚度,而刚度对腹板稳定性有显著的影响。

In this paper,the finite element elastic buckling analysis method was used to study the shear stability of metal webs with different opening diameters.In order to compensate for the loss of stability after opening,the reinforcement effects of common reinforcement rings and flanges under different hole sizes were discussed.The results show that the stability of metal web decreases with the increase of hole diameter.The effect of increasing flange flanging height and thickness to improve web stability is obvious.When the flanging height is 16 mm and the flange thickness is 1.5 mm,the reinforcement effect is the best.This is because the increase of flange flanging height and thickness is equivalent to the increase of stiffness around the opening,and stiffness has a significant impact on web stability.