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A famous steel structure building-Bird

A famous steel structure building-Bird's Nest

Beijing National Stadium, officially the National Stadium, also known as the Bird's Nest.It is a famous steel structure building in China.The stadium was designed for use throughout the 2008 Summer Olympics and Paralympics and will be used again in the 2022 Winter Olympics and Paralympics.  
Reinforced concrete frame shear structure and steel structure of bending and torsion members, the project cost is 3.3 billion yuan, the construction area is 258,000 m2, and the steel content of the external steel structure is 42,000 tons. The whole project includes steel in steel, rebar, etc. The amount reached 110,000 tons. The main steel structure forms a giant space saddle-shaped steel truss weaving "bird's nest" structure. The total steel capacity of the steel structure is 42,000 tons. The concrete stands are divided into upper, middle and lower layers. The concrete structure of the stands is 1 underground. 7-story reinforced concrete frame-shear wall structure system. The steel structure and the upper part of the concrete stand are completely disengaged, not connected to each other, and formally enclose each other, and the foundation sits on a connected base plate.The main structure design has a service life of 100 years, the fire resistance rating is one level, and the seismic fortification intensity is 8 degrees.
Construction of the stadium proceeded in several distinct phases, the first phase involving the construction of a concrete supporting structure upon the concrete foundations laid for the construction site. This was followed by the phased installation of the curved steel frame surrounding the stadium, which is largely self-supporting. This phased installation involved the interconnection of sections of the curved steel frame that were constructed in Shanghai and transported to Beijing for assembly and welding. The entire structure of interconnected sections was welded together as the primary means of interconnection used to assemble the entire surrounding nest structure. Upon removal of the supporting columns used for the purpose of expediting the assembly of the interconnecting sections, the completed nest structure as a whole settled approximately 27 cm to attain full stability before the interior design and construction of the stadium could be installed and completed.

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