通过10组轴压试验对双剪拼接角钢主材的轴心受力性能进行了研究，探究了不同节点螺栓连接长度（120 mm、180 mm、240 mm）和包钢面积比（1.08、1.22、1.31）对拼接角钢主材轴心受力性能的影响，从试验构件的受压极限破坏模式、极限承载力和荷载-位移曲线三个方面展开了对比分析，研究表明：当角钢主材无拼接节点时，其轴压极限破坏模式表现为跨中截面处发生绕主轴的弯扭屈曲破坏，平面外变形最大，扭转变形小；当角钢主材采用双剪拼接节点时，其轴压极限破坏模式分为两种情况：当双剪拼接节点处螺栓连接长度不大于120 mm或包钢面积比为1.08时，拼接角钢主材的受压破坏模式以跨中截面弯扭屈曲为主，且伴随有拼接节点破坏；当双剪拼接节点处螺栓连接长度大于120 mm且包钢面积比大于1.08时，拼接角钢主材的受压破坏模式为跨中靠近节点处弯扭屈曲与斜材处局部屈曲的耦合破坏。结合试验结果对规范现有计算方法进行了论证分析，给出了L125×10角钢主材的构造设计建议，该研究结论有利于推动输电线路结构设计技术的发展，为输电线路结构设计规范的编制完善奠定了技术基础。

The mechanical properties of the axial compression members of the double-shear splicing main members were studied through 10 sets of axial compression tests. The effects of different bolt connection lengths （120 mm， 180 mm and 240mm） and steel-clad area ratios （1.08， 1.22 and 1.31） were investigated. The ultimate failure mode， ultimate bearing capacity and load-displacement curve of the test members were compared and analyzed. The experimental results show that the ultimate failure mode of the angle steel main members without splicing joints is the flexural-torsional buckling failure around the main axis at the mid-span section， and the out-of-plane deformation is the largest and the torsional deformation is small. When the angle steel main member adopts the double-shear splicing joint， the axial compression ultimate failure mode is divided into two cases： when the bolt connection length at the double-shear splicing joint is not more than 120 mm or the steel-clad area ratio is 1.08， the compression failure mode of the main member is mainly mid-span cross-section flexural-torsional buckling， accompanied by the failure of the splicing joint. When the bolt connection length is greater than 120 mm and steel-clad area ratio is greater than 1.08， the compression failure mode of the splicing main member is the coupling failure of the flexural-torsional buckling at the mid-span near the joint and the local buckling at the inclined member. Combined with the test results， the existing calculation methods of the standards are demonstrated and analyzed， and the structural design suggestions of L125×10 angle steel main member are given. The research conclusions are conducive to promoting the development of transmission line structure design technology and laying a technical foundation for the compilation and improvement of transmission line structure design specifications.