On February 24th, 2003, the project started +65438, and was completed in March, 2008, with a total cost of 2.267 billion yuan. As national landmark buildings, the main stadium and the national stadium of the 2008 Olympic Games and the 2022 Winter Olympics have remarkable structural characteristics.
Extended data:
The external structure of the "Bird's Nest" is mainly composed of a huge portal steel frame and 24 truss columns. The design service life of the main structure is 100 years, the fire resistance rating is Grade I, the seismic fortification intensity is Grade 8, and the waterproof rating of underground engineering is 1. The main building of the project is a saddle-shaped oval with a length of 333 meters from north to south.
The giant space saddle-shaped steel truss weaves the "Bird's Nest" structure, with a total steel consumption of 42,000 tons, and the concrete stands are divided into upper, middle and lower floors. The concrete structure of the stand is a reinforced concrete frame-shear wall structure system, with 7 floors underground 1 floor and above ground. The steel structure and the upper part of the concrete stand are completely separated and not connected with each other.
Formally closed to each other, the foundation is located on a connected foundation plate. The roof steel structure of the National Stadium adopts a double-layer membrane structure, that is, a transparent upper ETFE membrane fixed between the upper chords of the steel structure and a translucent lower PTFE sound-absorbing ceiling fixed under the lower chords of the steel structure and the inner ring side wall.
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