Zifeng Tower
Zifeng Tower
History of NanjingLocated in the lower Yangtze River drainage
basin and Yangtze River Delta economic zone, Nanjing has long been
one of China's most important cities. It is recognized as one of
the Four Great Ancient Capitals of China. With an urban population
of over seven million (2011), Nanjing is the second-largest
commercial center in the East China region after Shanghai. It has
been ranked seventh in the evaluation of "Cities with Strongest
Comprehensive Strength" issued by the National Statistics Bureau,
and second in the evaluation of cities with most sustainable
development potential in the Yangtze River Delta. It has also been
awarded the title of 2008 Habitat Scroll of Honour of China,
Special UN Habitat Scroll of Honour Award and National Civilized
City
Panoramic view of Nanjing
Zifeng TowerFormerly Nanjing Greenland Financial CenterIt si
mixed-use complex comprising of several buildings resting on two
sites, parcels A1 and A2, parcel A1 contains a podium connecting
two towers . The taller 450m (1,476ft) tower consist of offices and
hotels and the 100m (328ft) tower contains purely office space .The
towers stepping is functional; officehoteland retail are located
above grade, while restaurants and a public observatory are housed
at the top of the tower, which is crowned with a spire.
Zifeng TowerProject Completion : 2009Design Completion :
2005Site Area : 28,294 sqmProject Area : 308,000 sqmNumber of
Stories : 66Building Height : 450mArchitect : Skidmore, Owings
& Merrill LLPLocation : Ninjing, China
Planning TriangularAdvantages - form relates to its site,
providing stunning views of the nearby mountains, lake, and
historical buildings. - serrated faade treatment is interesting . -
adding depth and texture to the imposing form while allowing
natural ventilation .Planning The shape and placement of the
building are designed to echo the geometry of the existing roads
and maximize exterior views of the city.The buildings composition
maintains the east-west viewing corridors along East Beijing Road
and provides a visual link to the nearby historical drum and bell
towers.Landscaping is a significant part of the complex as the
building are set back from the street with several large
landscaped, public open space.South of parcel A1, is a sunken
garden at that will connect to the future subway.There are is also
a roof garden at the top of the podium in the parcel A1 to reduce
the heat island effect.
Planning The office tower is served by floor, variable volume,
supply air handing units with variable speed drive. The office
tower is served by two banks of seven elevators, one bank for the
low-rise office levels and one for the high-rise office levels. Two
service elevators are designed as fire elevators and serve all
floors of the office tower (three separate service elevators will
serve all floors of the hotel) The hotel portion of the main tower
will be served by three express passenger elevators from the ground
floor entrance lobby to the level 36 sky lobby, where five local
passengers lifts will take guest up to the highest hotel level on
65.
Problems and Solutions1. Being constructed in a seismic region,
enhanced design measures and performance- based evaluations were
utilized in order to obtain seismic review approval for the main
tower. The critical parts of the lateral system were design for
earthquake forces between two and six times more than typically
required by Chinese code. Additionally, a full 3- Dimensional
Non-Linear Elasto Plastic analysis for a 2500 year earthquake was
completed to determine the structure response and
serviceability.Problems and Solutions2. The tower features a unique
faade system, rather than a typical flush-glass curtain wall
system; it is composed of offset modular panels that protrude in
plan to create a distinctive texture to the buildings elevations.-
Each curtain wall is a triangle in plan and shifts a half module
between each floors.- It creates a scaled effect and has a very
unique visual appeal in catching the light and reflections of the
city.- The small edge of the triangle unit is a fixed perforated
metal panel with a hidden operable panel behind it for natural
ventilation and smoke exhaust. This will help to reduce mechanical
ventilation energy usage during some transitional session.- The
long edge of each triangle units consist of a high performance
insulated low-E glass panel, to help to cut down the heat gain
through the building.
Awards Best International project over $150 million of 2010 (
Structure Engineers Association of Illinois ) the sixth tallest in
the world at completion the seventh tallest in the of 2013
