关键词： 开孔网壳结构, 力学特性, 屈曲模态, 数值分析, 稳定性

Abstract: Taking the reticulated shell structure node as the main research object,the numerical model of the main reticulated shell structure of the dry coal shed of the power plant is constructed,the buckling mode of the perforated reticulated shell structure is studied,and the nonlinear buckling analysis is carried out to explore the static characteristics under vertical load and wind load.It is found that the stress concentration occurs at the opening of the reticulated shell.The maximum stress of the joint under the vertical load is 0.037 kPa,and the maximum stress of the joint under the wind load is 0.024 kPa.The maximum displacement of the node under the vertical load is 0.881 mm,and the maximum displacement of the node under the wind load is 1.692 mm,which is 69.34% and 19.57% higher than the average displacement of the node of the whole reticulated shell structure,respectively,which meets the requirements of the code.In the eigenvalue buckling analysis,some members of the rigid joint reticulated shell structure are deformed,which has a certain influence on the structural safety.After the re-optimization design of the reticulated shell,some joints adopt hinged joints,and the eigenvalue buckling load is 4.12% higher than that of pure rigid joints,which effectively improves the stability of the reticulated shell structure.

Key words: open-hole reticulated shell structure, mechanical activation behavior, buckling mode shape, numerical analysis, stability