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利用ANSYS软件对楔形变截面受弯构件进行弹塑性稳定分析,考虑截面塑性开展,引入通用长细比,在通用长细比中考虑楔率和弯矩线性变化的影响,拟合得到新的弯扭屈曲稳定系数公式。对于变截面压弯构件的平面外稳定,提出弯矩项带指数的光滑曲线相关公式,其中轴力项和弯矩项均取自大端的内力及其截面性质,弯矩项的指数考虑长细比和楔率的影响,将拟合公式与有限元程序结果进行对比发现,公式的精度非常好。
The elasto-plastic stability analysis of flexural members with wedge-shaped cross-section was carried out by ANSYS software. Considering the plasticity of section, the universal slenderness ratio was introduced and the effect of linear change of wedge and bending moment was considered in the general slenderness ratio. Buckling stability coefficient formula. For the out-of-plane stability of variable-cross-section members, the formula of smooth curve with bending moment index is proposed. The axial force and moment are taken from the large-end internal forces and their cross-sectional properties. Ratio and wedge rate, the fitting formula and finite element program results were compared, the accuracy of the formula is very good.