利用截面特性的近似值得出单角钢和双角钢构件的实用计算公式。
Using approximate section properties, practical formulas are derived for single and double angle sections.
结合双角钢桁架节点现有的研究成果，包括文中介绍的几种节点计算方法。
Combining with the current study achievement of double-angle truss joint, including several calculating methods which will be introduced in the thesis.
在目前的输电铁塔设计中，双角钢应用普遍，而填板的计算设计却缺乏相应的规范。
Nowadays, two angle steel is generally used in the design of transmission steel towers.
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