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采用ANSYS软件建立的考虑初始几何缺陷和残余应力影响的有限元模型分析了板件宽厚比、构件长细比以及荷载相对偏心率对构件极限承载力的影响;提出了利用有效屈服强度系数来计算构件极限承载力的建议公式。研究表明:板件宽厚比(或构件长细比)增大均会导致构件无量纲极限承载力减小,且无量纲极限承载力的减幅会随偏心率的增大而减小;偏心率增大也会使构件无量纲极限承载力减小;构件弯矩-轴力相关曲线大致呈线性变化;建议公式计算结果与有限元计算结果吻合较好。
The finite element model considering the influence of initial geometric imperfections and residual stresses established by ANSYS software was used to analyze the effect of plate thickness to thickness ratio, slenderness ratio and load relative eccentricity on the ultimate bearing capacity of members. The effective yield strength coefficient Proposed formula of ultimate bearing capacity of members. The results show that increasing the ratio of plate thickness to thickness (or the slenderness ratio of members) leads to the decrease of the dimensionless ultimate bearing capacity of members, and the decrease of non-dimensional ultimate bearing capacity decreases with the increase of eccentricity. The eccentricity Increasing will also reduce the dimensionless ultimate bearing capacity of member, and the curve of bending moment and axial force of member will change approximately linearly. The calculation results of proposed formula are in good agreement with the finite element calculation.