Internal structure of Beijing National Stadium (1:1000) model
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The roof rests on 24 sturdy steel frames, carefully arranged to minimize the strain on the joints where they meet. To achieve this, each frame is positioned nearly tangent to the ring that forms the roof's perimeter. This configuration allows for maximum flexibility and strength in the structure. The steel frames are aligned along an ellipse, a shape that maximizes internal space while providing optimal support. To determine the ideal ratio of width to length for the ellipse, engineers employ specialized software, known as GH programme, which generates intricate steel frame designs based on two key variables: the number of frames and their precise locations.
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