Shanghai---The world's second tallest building, Shanghai Tower, will soon open in the Chinese financial capital with a twist -- a 120-degree twist, to be exact.
A softened triangular "outer skin" is literally twisted around a circular core, sending the glass and steel tower spiralling 632 metres (2,086 feet) into the grey sky above the city.
State-backed developer Shanghai Tower Construction and Development Co. views the modern design as a symbol of China's future, a super-tall building in the city's gleaming Pudong financial district, which did not even exist 25 years ago.
People involved with the project said the building will open this summer, with office tenants moving in first, but the developer declined to comment.
"This twist is an iconic symbol of looking forward for the Chinese people," said Grant Uhlir, practice area leader and principal for Gensler, the US architecture firm whose design was chosen for the building which broke ground in 2008.
"It's been referred to as a strand of DNA. It's also been referred to a place where the ground connects with the sky," he said.
Although still dwarfed by the reigning champion Burj Khalifa in Dubai, which stands at 828 metres (2,732 feet), and with new challengers under construction, the $2.4 billion Shanghai Tower can still lay claim to a host of superlatives.
Besides being the tallest double-facade building, the world's fastest elevators travelling 18 metres per second will whisk people up and down while the globe's second highest hotel will be located on the 84th to 110th floors.
An estimated 16,000 to 18,000 people will pass through the Shanghai Tower every day. The building will sway up to a metre (three feet) in high winds, with a 1,000-tonne "damper" weight near the top reducing the effect.
- 'It has to be unique' -
"When you do these iconic, super-tall buildings, it can't be a copy of something else. It has to be unique," said American chief architect Marshall Strabala, who participated in the project while at Gensler.
Now the head of his own firm, he spent part of his three-decade career working on some of the world's tallest buildings including the Burj Khalifa.
He said the double skin plays other roles besides pure design, providing insulation to keep the building cool in summer and warm in winter and reducing wind stress.
"This building is a giant Thermos bottle, that's all it is," he said.
But the vacuum flask metaphor masks the mind-numbing complexity involved in balancing the design, safety requirements, building codes and client demands that shaped the tower.
AFP
