单层空间网格结构刚性节点的衍生式生成方法研究OA北大核心CSTPCD

The joints of the single-layer free-form spatial grid structure are the most concentrated parts of the structure,and should have reasonable configurations and excellent mechanical performances.At present,the most widely used rigid joints in single-layer spatial grid structures are of single type,have large deadweight,are prone to stress concentration,and have uneven joint quality.This paper proposes a generative generation method for rigid joints of single-layer spatial grid structures.Firstly,the basic principle of generative generation method is introduced,and its mathematical model is given.Secondly,based on the generative generation method,the diversified design results of the new rigid joint configurations of single-layer spatial grid structures with different reserved masses,circumferential symmetry constraints and changed reserved geometry are obtained.Then,the static performance of the new rigid joint configuration is compared with that of the traditional welded hollow spherical joints.The results show that the generative generation method has a strong exploration and innovation ability,and the new rigid joints obtained are novel in shape,and are light and beautiful.Compared with the traditional welded hollow spherical joint,the mass,the maximum equivalent stress and the maximum displacement can be reduced by 57.1％,29.13％and 36.36％,respectively.The generative generation method proposed in this paper can realize the diversified design of single-layer spatial grid structure joints that are lightweight,high-strength,safe and beautiful.