Firstly, for holistic substructure, the substructure was simplified as simple frame structure based on principle of equivalent fundamental periods.

首先，当下部结构为整体支承结构时，提出将下部结构按基本周期等效简化为简单框架结构。

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Firstly, for holistic substructure, the substructure was simplified as simple frame structure based on principle of equivalent fundamental periods.

首先，当下部结构为整体支承结构时，提出将下部结构按基本周期等效简化为简单框架结构。

youdao