中文摘要：

角钢具有储存、运输方便,节点构造简单的特点,因此在输电铁塔结构中得到广泛应用。为了构造方便,新型非四边形截面杆塔采用等边角钢时需要对角钢进行开/合角处理,而角钢开/合角会改变其截面特性,因此研究开/合角等边角钢轴心受压时的稳定性和经济性对于新型非四边形截面杆塔的设计具有重要意义。采用逆算单元长度法并结合ANSYS非线性屈曲分析,计算了开/合角等边角钢的柱子曲线,经过拟合给出了轴心受压开/合角等边角钢的稳定系数与长细比的关系,通过ANSYS分析结果、试验结果与逆算单元法计算结果的对比分析,研究了等边角钢开/合角后的整体稳定性和力学性能,给了开/合角角钢经济性的评价指标,研究了开/合角等边角钢的经济性,所得结论对于新型非四边形截面杆塔的合理选材具有理论指导意义。

英文摘要：

As it is convenient to store and transport and simple to construct, the angle steel is widely used in transmission tower structure. In order to make joint construction convenient, the new non-quadrilateral crosssection tower using equilateral angle steel angle which needs to be unfolded or folded, however, it will change the properties of the cross-section. Therefore, it is important to study the stability and economy of the unfolded or folded equilateral angle steel which determines the safety and economy of the new designed non-quadrilateral cross-section tower. In this paper, the inverse calculation segment length method and nonlinear buckling analysis method based on ANSYS software are applied to calculate the stability of the unfolded or folded equilateral angle steel. The column curves of several kinds of equilateral angle steel were calculated and the relationship between stability coefficient and slenderness ratio of the unfolded or folded angle equilateral angle steel suffering from axial compression are obtained by fitting the results. Through the comparison of the results of ANSYS, the experimental results and calculated results of the inverse calculation segment length method, the overall stability and the change of mechanical properties are studied. In addition, the economy of unfolded or folded angle is given by using the presented economy indicators. The conclusion from above is useful for the design and reasonable selection of member of the new non-quadrilateral cross-section tower.