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为了探索将结构最优设计的成果应用到设计规范中去,本文建议一种简便的优化设计方法,即变化同一类型结构及其荷载的主要参数求出这些情况下结构的最优设计,并把所得大量最优设计方案进行统计分析,找出这种结构的最优刚度分布或最优强度分布的统计经验公式,然后即可把它们用来作为类似条件下设计这种结构的“经验优化准则”。对一般结构,可以直接把这样得到的优化准则作为它们的设计方案,然后按常规方法进行设计。这样在不增加计算工作量的情况下便可以收到相当的优化(经济)效果。当设计的要求较高时,可按优化准则作出“初始方案”,然后再按各种最优化方法进行设计,这时可以减少迭代次数,从而大大减少计算工作量。本文利用上述概念,对108个剪切型多层框架进行了满控抗震设计,得出了它们的优化方案,并据此求出了相应的最优刚度分布。显然本文提出的方法还可用于研究其他结构在各种条件下的经验优化准则。
In order to explore the application of structural optimal design results to design specifications, this paper proposes a simple optimization design method that changes the main parameters of the same type of structure and its load to find the optimal design of the structure under these conditions, and A large number of optimal design solutions are obtained for statistical analysis, and the statistical empirical formulas for the optimal stiffness distribution or optimal intensity distribution of such structures are found. Then they can be used as an “empirical optimization criterion for designing such structures under similar conditions. “. For the general structure, the optimization criteria thus obtained can be directly used as their design solutions, and then designed according to the conventional methods. In this way, considerable optimization (economic) effects can be achieved without increasing the computational workload. When the design requirements are high, an ”initial plan" can be made according to the optimization criteria, and then the design can be performed according to various optimization methods. In this case, the number of iterations can be reduced, thereby greatly reducing the calculation workload. In this paper, using the above concept, 108 shear-type multi-story frames were subjected to full-controlled seismic design, and their optimal solutions were obtained. Based on this, the corresponding optimal stiffness distributions were obtained. Obviously the method proposed in this paper can also be used to study the empirical optimization criteria of other structures under various conditions.