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Located in the Central Business District the 300m high tower at the south facade addresses the street, while the secondary entrance on the west facade relates itself to the park. The plinth also has an orientation to both south and west directions, but allows for the southwest corner of the tower to be exposed which additionally emphasizes the solid presence of the tower at this corner of the site. The tower has a constant, efficient, square floor plate. The total tower height is around 300m including the tip, and the side dimension is approximately 45m x 45m. The façade strategy of the building is simple, elegant and redefines the classical high-rise tower into a contemporary architectural language. Since the profiles have certain depth, they also provide a significant impact as sun shading elements which reduce glare and direct radiation into the office interior. The structural scheme of the tower is a tube in tube with an internal concrete core and a perimeter structure aligned with the regular 3m grid of the façade. Thanks to the density of the grid, the perimeter structure will have a large lateral stiffness. As a consequence the core will attract less load and the core walls can be optimized. The dual system composed of the perimeter and the core provide substantial stability and ductility for such a tall building in a high seismic zone like Beijing. At refuge floors, belt trusses will be used to stiffen the structure. As the perimeter structure is quite strong, outriggers might not be necessary so that the overall construction program can be shortened. The regularity of the perimeter structure will make possible the use of standard prefabricated structure modules. This can help to significantly reduce the construction time and cost. The floor system is suggested to adopt the composite decking supported by steel beams, which has the merits of providing a fast-track construction program and reducing the self weight and therefore the seismic forces. Considering the height of the building, concrete bore piles will be the foundation. Based on experiences of the nearby projects, the founding level might be layer 9 or layer 12. The basement will be the normal concrete beam-column construction which transits all the gravity and lateral loadings to the foundation through a thick pile cap. The design of the basement will be closely coordinated to the construction of the public area and adjacent sites in the CBD core area. |