基于连续强度法的铝合金箱型截面轴压构件稳定承载力研究

Research on Stability Bearing Capacity of Aluminum Alloy Box Section Axial Compression Members Based on Continuous Strength Method

目的将连续强度法(Continuous Strength Method,CSM)应用到6061-T6铝合金箱型截面轴压构件稳定承载力预测上,解决连续强度法仅适用于计算构件截面承载能力的问题。方法采用有限元软件ABAQUS建立试件的有限元模型,在已有的试验验证的基础上进行扩大参数分析,研究我国铝合金规范对不同截面柔度系数和正则化长细比构件稳定承载力预测的准确度;基于连续强度法对我国规范的稳定系数计算公式进行修正,提出适用于连续强度法的稳定承载力计算公式,将两种方法的计算结果进行对比。结果我国铝合金规范对截面柔度系数在0.228~0.906内构件的稳定承载力预测普遍偏于保守;对长细比较大构件的稳定承载力预测较保守;笔者提出的修正计算公式能够获得更加精确的结果。结论笔者提出的公式比我国铝合金规范更准确地预测铝合金轴压构件的稳定承载力,且离散度更低,为铝合金构件的稳定设计提供新的设计参考方法。

The CSM was proposed in this paper to determine the member buckling resistance of 6061-T6 aluminum alloy box section axial compression columns,which solved the problem that the continuous strength method is currently limited to the determination of cross-sectional resistance only.The finite element model was established and verified by using analysis software ABAQUS based on experimental results.The expanded parameter analysis was carried out to study the accuracy of Chinese code for the determination of member buckling resistance of columns with different section slenderness and member slenderness;Based on the CSM,the calculation formula of stability coefficient in Chinese code is modified,and the calculation formula of member buckling resistance suitable for the CSM is proposed.The determination of member buckling resistance of columns with section slenderness in range of 0.228~0.906 in Chinese code,as well as large member slenderness,is generally conservative.Compared with the results of FE data and two design methods,it shows that the CSM provides more accurate member buckling resistance predictions than Chinese code,the proposed calculation method provides a new design reference method for the stability design of aluminum alloy columns.