'Bird's Nest' – National Stadium

(Yuanda Enterprise Group)
Updated: 2008-07-31 23:39

The design proposal for the stadium is based on the use of scientific and simple space structures, novel building design, unique structure, overall unification and the perfect combination of architecture and structure, ensuring that after the completion of construction, the stadium will become both a unique and symbolic building.

 

The membrane structure of the National Stadium consists of a roof enclosing structure; acoustics suspended ceiling and internal ring elevation cladding membrane structure three parts. The upper chord of roof system adopts single-layer stretching membrane system as maintenance structure of roof for wind and rain resistance and sunlight shading, the transparence ETFE membrane material with the glaze point is selected and disposed on comparatively flat roof and the adjacent area between the elevation and roof. The acoustics suspended ceiling of lower chord for roof system adopts white translucence PTFE membrane system as denoise layer and sunlight shading layer at stand area, which is hung beneath the lower chord of main frame and substructure, meanwhile extends downwards from back of upper story stand, functions as screen. The elevation of the interior framework of roof opening (internal ring surface) is sealed with PTFE membrane for good waterproofing quality.

The single-layer ETFE stretching membrane structure of roof consists of 1038 membrane units, with total area about 38500m2. On the roof, the drainage gutter is set up along the inside of lattice unit constituted by interwove steel beam, the ETFE membrane unit is fixed on the border of gutter after stretching. The ETFE membrane material is essential difference from the PTFE membrane material, the PTFE membrane material is elastic material formed by fabric, which is easy for stretch forming; whereas ETFE membrane material is high polymer chemistry material, which belongs to elastic and plastic material, with the limited elasticity, and is more suitable for charge membrane system. Therefore, the high precision of supporting structure for ETFE membrane unit is essential. Furthermore, the ETFE membrane unit shape is very complex, especially at shoulder area, the membrane unit and bracing member should without exception be made into complicated hyperboloid form. The design, manufacture, transport, installation and construction are difficult and challenging. The successful construction of the project is another pioneering work in the field of membrane structure internationally.

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