Multi-objective Optimization Of Local Single-layer And Double-layer Spherical Reticulated Shell Structure In EPC Mode

The latticed shell structure has the characteristics of reasonable force,large stiffness,light weight,simple on-site installation,novel and rich structural forms,etc.,It is deeply favored by structural engineers and widely used in many large public buildings.partial double layer latticed shell structure has better overall stability compared with the single-layer and has better visual space and less weight with double-layer.So far,the research on the optimization of latticed shell structure in related literature mainly focuses on the section optimization of common latticed shell,the research on the optimization of local single-layer and double-layer latticed shell is rare,especially the multi-objective optimization of local single-double-layer latticed shell under EPC mode.This paper has carried out multi-objective optimization for the structure weight,stability and single-layer range of the structure.And presents a method of taking one single item of multiple objectives as the main objective and setting the range target value of other items as the state variable for optimization.Although the local single-double-layer latticed shells have the advantages of both single-layer and double-layer latticed shells,it is also noted that the overall instability and collapse of large-span latticed shells often occur at home and abroad.In the end of this paper,the geometric nonlinear buckling analysis that with the initial structural defects is used to verify the effectiveness of the optimization scheme.