Shanghai Tower, China
The Outstanding Structure Award recognises the most remarkable, innovative, creative or otherwise stimulating structure completed within the last few years The Shanghai Tower, China, has been awarded with the Outstanding Structure Award 2016. The Outstanding Structure Award Committee 2016, chaired by Paul Lüchinger, Switzerland, made the following statement:
“With the Shanghai Tower the town's skyline gains a new outstanding landmark. The innovative structural interaction of the double-skin curtain wall ushers in a future generation of design concepts for high-rise buildings”.
Shanghai Tower is situated in Shanghai’s Lujiazui Finance and Trade Zone, adjacent to the Jin Mao Tower and Shanghai World Financial Centre,which has a Gross Floor Area (GFA) of approximately 580,000 m2. Its structure height is 583.4m, and total height is 632m, which is the first 600m+ multi- function skyscraper in China. Important targets for the Shanghai Tower were energy saving, low-carbon consumption trying to build the entire project into a green, environment friendly, multi-functional vertical city.
The main challenges were the soft foundation with deep excavation in congested CBD core area; the cooperative work between the curtain wall support system and main structure with special connection details; and the control on the effect of construction on curtain wall system during the design and construction process. The twisting and taper outer curtain wall system which is separated from the main structure is a significant feature of the building and was a great challenge. The inner skin is circular, while the outer skin is round triangle shaped in plan which twists and tapers along the vertical direction. The spatial separation between the two skins creates a sky lobby every 12 to 15 floors within each of zones. The separated double-skin curtain wall makes the outer exterior curtain wall design relatively independent from the main structure, and increases the freedom of the skin geometry design. The shape of the outer exterior curtain wall is designed as aerodynamic configurations to reduce wind load. Wind tunnel tests indicate that comparing to general square taper shape, the twisting and tapper shape of Shanghai Tower can reduce 24% wind load, and equivalent body coefficient along-wind is only 0.95, resulting in good economic benefits.