The external structure of the "Bird's Nest" is mainly composed of a huge portal steel frame and 24 truss columns. The top of the National Stadium is saddle-shaped, with a major axis of 332.3 meters, a minor axis of 296.4 meters, a height of 68.5 meters at the highest point and a height of 42.8 meters at the lowest point ... On the premise of keeping the architectural style of the "Bird's Nest" unchanged, the new design scheme has a great influence on the structural layout.

A large number of steel structures are box-shaped members welded by steel plates, and the cross-arranged main trusses, together with the substructure of the roof and facade, form a special architectural shape of "Bird's Nest". The main stand adopts reinforced concrete frame-shear wall structure system, which is completely separated from long-span steel structure.

Extended data:

The design scheme of the National Swimming Center is the "Water Cube" ([H2O]3) scheme produced by the global design competition. This design embodies the design concept of [H2O] 3 ("Water Cube"). Beijing State-owned Assets Management Company is responsible for the construction, management and operation of the National Swimming Center, which was started at the end of 2003 and put into trial operation before the end of 2007.

Accept the inspection and acceptance by the International Swimming Federation and the International Olympic Committee. "Water Cube" is the national swimming center of Beijing Olympic Games, and its membrane structure is the highest in the world. It is designed according to the arrangement of cells and the natural structure of soap bubbles, which has never appeared in architectural structures, and its creativity is very strange.

Baidu encyclopedia-national swimming center