Chengdu Dongcun Greenland Tower in Chengdu, China. Courtesy Greenland Southwest.
Inspired by the neighboring landscape, the architectural design for this mixed-use tower adopts a highly complicated geometry consisting of facets sloping in all directions to resemble the snowy mountains. The tower is 101 stories above grade with five below. Surrounding the main tower are two smaller towers, respectively 167 and 174 meters, and a six-story podium.
Thornton Tomasetti is providing structural engineering services for the schematic design and design development phases, and structural peer review services for the construction documents phase. A key challenge was developing a structural system that integrates elegantly into the architectural design. The main lateral force resisting system is a steel reinforced concrete core wall with sixteen steel reinforced concrete columns, which zig-zag along the height of the tower following the architectural design surface. The second lateral force resisting system includes a high-performance brace frame system made of steel-reinforced concrete columns with an outer periphery of steel beams and braces. The braces are located on the edges of the surface facets, serving as both the structural members and architectural components. The main tower features a core wall with sloping walls and represents the first use of this system in a high-rise building in China. The final product is a highly integrated and efficient structural system for this super tall building in an active seismic zone.
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