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螺栓连接的组合角钢是输电线路工程常用的结构形式,需要计算的内容有:组合断面绕虚轴的整体稳定、连接螺栓的剪力、分肢角钢的受压和受弯、双拼十字断面缀板的强度。然而现行规范GB50017—2003《钢结构设计规范》未给出计算公式,其中给出的填板间距更适合焊接或铆接的组合断面。欧洲钢结构规范对于连接螺栓的剪力也未给出计算公式。由于普通螺栓连接的滑动引起承载力降低,对绕虚轴剪切变形较小的组合角钢,可以不考虑填板厚度引起的虚轴回转半径增大;而对绕虚轴剪切变形较大的双拼十字组合角钢,按格构式轴心受压缀板组合构件的原理,对换算长细比加以修正放大,计算整体稳定;根据挠曲变形,给出连接螺栓的剪力和分肢角钢承载力的计算公式。
Combination of bolted angle is commonly used in power transmission line engineering structure, the need to calculate the contents of the composite section around the imaginary axis of the overall stability, the shear force of the connecting bolt, the pressure and bending angle of the limbs, Shuangpin cross-sectional patchwork The strength of the board. However, the current code GB50017-2003 “Code for design of steel structure” does not give the formula, which gives the filler plate spacing is more suitable for welding or riveting combined cross-section. The European Steel Code also gives no formula for the shear of connecting bolts. Due to the decrease of bearing capacity due to the sliding of common bolt connection, the radius of the imaginary axis turning radius caused by the thickness of the filler plate can be increased for the composite angle steel with smaller deformation about the imaginary axis, and the shearing deformation about the imaginary axis is larger According to the deflection deformation, the shear force of the connecting bolt and the angle of the extremity angle steel are given according to the principle of the lattice structure axis compaction plate composite member, and the correction of the slenderness ratio is enlarged and corrected. Calculation formula of bearing capacity.