平面杆系几何组成“四步分析法”

“Four-step Analysis Method” of Plane Frame

杆系几何组成分析是设计杆系结构的一项重要内容,也是结构力学中的一个难点。笔者针对难点抓其主要矛盾,总结出刚片和链杆的一般认定方法;应用刚片之间的联系网络图,紧凑、全面、直观地反映刚片之间的约束情况;根据刚片联系网络图直接划分构造层,逐层进行几何组成分析。使分析过程可遵循一定的程式进行,并用括号分层的形式简洁表达分析过程。

Geometric composite analysis of frame is an important content for designing frame structure ,as well as a difficult point in Structural Mechanics .The author summarized the identification method of rigid member and chain-pole ,using correla-ted graphs to reflect the restraining situation of rigid members .The structural layer was divided by rigid body graphs and geo-metric composite analysis was made .The analysis process followed certain procedure and concisely expressed by brackets laye-ring .