文中介绍了三水二桥主桥上、下部结构设计特点，及对主桥结构进行了受力计算与分析。

This paper introduces the design characters of superstructure and infrastructure of Sanshui Second bridge. The main bridge structure and mechanical calculation are introduced too.

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整个设计过程包括四部分内容：水文计算，上部结构设计，下部结构设计，施工工艺设计。

Entire design process including four partial contents: Hydrology computation, superstructure design, substructure design, construction technological design.

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采用该设计方法，以典型民机机身下部结构设计问题为算例，对客舱地板支撑结构，货舱地板和泡沫构件形状参数进行优化。

Using this design approach, a typical civil aircraft fuselage structural design with the shape parameters of the cabin floor struts, cargo floor and foam components has been studied as design case.

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