60°角钢轴心受压构件肢件宽厚比限值的研究

Study of limit value of width-to-thickness ratio of axial compression limb member of 60-degree angle steel

文章针对60°角钢局部稳定受力性能的问题,以薄壁构件稳定理论为基础,采用Rayleigh-Ritz法进行60°角钢轴心受压构件局部稳定的理论分析,得到60°角钢肢件的临界屈曲应力。根据"等稳定"准则推导出适合于60°角钢肢件宽厚比限值的表达式,与相应的设计方法和计算公式进行了对比分析。并且通过采用有限元分析软件ANSYS对60°角钢进行屈曲分析,验证了60°角钢宽厚比限值表达式的正确性。

For the problem of the mechanical performance of local stability of 60-degree angle steel, the theoretical analysis of local stability of axial compression member of 60-degree angle steel is conducted by adopting the method of Rayleigh-Ritz based on the stability theory of thin-walled member, and the critical buckling stress of 60-degree angle steel limb member is obtained. The expression formula suit- able for limit value of width-to-thickness ratio of 60-degree angle steel limb member is deduced accord- ing to the equal stability criterion and then compared with the corresponding design approaches and calculation formulas. And the buckling analysis of 60-degree angle steel is made by using the finite el- ement analysis software ANSYS so as to validate the correctness of the expression formula of limit value of width-to-thickness ratio of 66-degree angle steel.