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1、绪言土木结构的最优设计,一般情况下,设计变量和约束条件式的数目非常多。因此,在减少必要的计算容量的同时,设法缩短计算时间,提高计算效率,便成为最大的课题。施米特(Schmit)等对最优设计的研究可以说已经进入到第二阶段,把研究的重点已经转到保证最优计算的正确解,特别从实用方面考虑,设法提高其计算效率。直到现在,以提高计算效率为目的所进行的尝试主要有以下几方面。首先是所谓分群最优法(suboptimization),把复杂的最优设计问题在合理的范围内分成若干独立群,先在各群中进行最优化,将其结果用尽可能少的设计变量和约束条件式表示出来,各群的结果积
1, Introduction The optimal design of civil structure, under normal circumstances, the design variables and the number of constraints is very large. Therefore, to reduce the necessary computing capacity at the same time, try to shorten the calculation time, improve computational efficiency, has become the biggest problem. The research on optimal design, such as Schmit, can be said to have entered the second stage. The emphasis of the research has shifted to the correct solution for ensuring the optimal calculation. In particular, practical considerations are taken to improve the computational efficiency. Until now, attempts to improve computational efficiency have mainly been made in the following aspects. The first is the so-called suboptimization, which divides complex optimal design problems into several independent groups within a reasonable range. First, it is optimized in each group, and the result is used with as few design variables and constraints as possible Expressed, the result of each group