螺栓球节点的CAD辅助设计与软件开发

结合网架（网壳）CAD软件开发，根据螺栓球节点各构件的几何约束条件和强度约束条件，提出了一种螺栓球节点设计的计算，根据螺栓直径和几何构造首先确定各构件的几何尺寸，然后综合考虑各构件的强度约束确定每种螺栓对应的最大允许拉力和最大允许压力。利用该法进行节点设计，在有限元分析确定各杆轴力和管径的基础上可将螺栓球节点各构件一次性确定，避免了试选和反复验算。并对螺栓球设计公式进行了修改，利用修改后的公式进行设计，不仅可大大减轻螺栓球节点的设计、绘图、加工的工作量，而且可使杆件类型大为减少。

Computer aided design and software development for bolt-sphere joints

Combined with CAD software development of grids(reticulated shell),the design method of bolt-sphere joint is put forward based on geometry restriction and intensity restriction. The geomitry dimension of each component is determined firstly based on bolt diameter and contexture, then, maximal pull and stress of diversitied bolt are given after intensity restriction of all components is taken into acount. The joint components can be determined directly based on the axile forces and diameters of each bars given by the finite element analysis, and reduplicative checking computations can be avoided by the method. Then design formulae of bolt-sphere are modified, which can reduce not only the workload of design,drawing and machining for bolt-sphere joints but also the types of members.