在普通钢屋架的设计过程中,节点的构造处理和计算是一个重要的环节。一般常把节点计算和“放小样”结合起来绘制施工图。但因所采用的比例较小,绘制的施工图与其实样有较大误差。为了保证节点尺寸,大都采用加大节点板的方法来补其不足。即使如此,也难免在施工制作中再行修改,甚至影响到支撑系统的相应修改和变动。因此,不仅设计精度不高,而且也多用了钢材,不够经济。本文试用三角函数法与定数相结合, In the design process of ordinary steel truss, the construction and calculation of the node is an important link. It is common to combine node calculations with “small samples” to draw construction drawings. However, due to the small proportion used, there is a large error between the construction drawings drawn and their actual samples. In order to ensure the size of the node, most of the methods are used to increase the size of the node board. Even so, it will inevitably be revised in the construction process, and even affect the corresponding changes and changes in the support system. Therefore, not only the design accuracy is not high, but also the use of steel is more expensive and less economical. This paper tries to combine the trigonometric function method with the fixed number,