“鸟巢”建筑风格不变的前提下，新设计方案对结构布局、构建截面形式、材料

Under "Bird's Nest" architectural style of the same premise, the new design of the structure and layout, building section form, material utilization and other issues were more substantial adjustment and optimization. The original design was canceled roof can be opened, the roof opening to expand, and by optimizing the steel greatly reducing the amount of steel. Large span roof truss 24 is supported on columns, column spacing of 37.96 m. Main truss roof opening around the intermediate radial arrangement, with 22 Pin main truss through or close to straight. In order to avoid overly complex node occurs, a small amount of the main truss truncated near the inner ring. Extensive use of steel box-shaped member welded steel plate, forming a "nest" of special architectural style arrangement with crossing the main truss and the secondary structure of the roof and facade. Grandstand frame part is a reinforced concrete shear wall system with large span steel structure fully disengaged.

Under the premise that the architectural style of "Bird's Nest" does not change, the new design scheme makes a large adjustment and optimization of the structural layout, the form of construction cross-section and the utilization rate of materials. The openable roof in the original design was cancelled, the roof opening expanded and the amount of steel used was greatly reduced through the optimization of the steel structure. The large span roof is supported on top of 24 truss columns with a distance of 37.96 meters. The main truss is arranged around the opening radiation in the middle of the roof, with 22 main trusses leading through or close to the roof. To avoid overly complex nodes, a small number of main trusses are truncated near the inner ring. The steel structure is a large number of box-shaped components welded from steel plate, and the cross-arranged main truss together with the substructure of the roof and facade form the special architectural shape of the "Bird's Nest". The main grandstand part adopts a shear wall structure system with reinforced concrete frame, which is completely detached from the large-span steel structure.

Under the premise that the architectural style of "bird's nest" remains unchanged, the new design scheme has made great adjustment and Optimization on the structural layout, construction section form, material utilization and other issues. In the original design, the openable roof is cancelled, the roof opening is expanded, and the steel consumption is greatly reduced through the optimization of steel structure. The long-span roof is supported on 24 truss columns with the column spacing of 37.96m. The main truss is arranged radially around the opening in the middle of the roof, with 22 main trusses passing through or nearly passing through. In order to avoid too complex nodes, a small number of main trusses are cut off near the inner ring. The steel structure adopts a large number of box members welded by steel plates. The main truss arranged crosswise, together with the secondary structure of the roof and facade, forms the special architectural shape of "bird's nest". The main stand part adopts reinforced concrete frame shear wall structure system, which is completely separated from the long-span steel structure.<br>