The essential difference between "green productive forces" and other forms of productive forces lies in the difference of restraining conditions.

“绿色生产力”与其他形态的生产力相比其根本区别在于约束条件不同。

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After determining the designed variables and objective functions, five restraining conditions for multiple objectives optimization are derived from its own structure.

在确定了设计变量及目标函数的基础上，根据结构本身的要求，推导出用于多目标优化的五个约束条件。

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This model is based on a complex shape model and with it the optimal result can be obtained for most light frame structures and the restraining conditions can be satisfied.

结论为：无论框架的结构和荷载特征如何，在满足应力约束的前提下，只要恰当改变梁或柱的截面尺寸，用复形法即可得到位于位移约束边界上的最优点。

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