杆件分组和网格密度对网壳截面优化结果影响

摘要

In this paper, the sectional optimization with the lightest weight of the shell structure as the objective function is carried out by using two level optimization methods based on discrete variables and the style of bar group and the effect of different mesh densities on optimal results are mainly considered. In the course of the optimization procedure, integral stability constraints are shown to be good for practical engineering. For K6 type of single-layer shell structure with span of 50m and rise-span ratio of 1/5, 42 shell models with six different bar groups and seven different mesh densities were built and optimized. Finally, an new and better choice of bar group and mesh density is obtained.%针对跨度为50m,矢跨比为1/5的单层凯威特K6型球面网壳结构,对6种杆件分组方式、7种网格划分密度的42个网壳模型进行截面优化分析,得出了与以往截面优化不同的、优化效果更好的杆件分组方式和网格划分密度取值建议,优化过程充分考虑了网壳结构强度、刚度和整体稳定性,使优化结果更具有工程实用价值.可为工程设计人员提供有益的参考.