Zifeng Tower 5r55r

• Located 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

• Formerly Nanjing Greenland Financial Center • It 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 tower’s stepping is functional; • office • hotel • and 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.

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Project Completion : 2009 Design Completion : 2005 Site Area : 28,294 sqm Project Area : 308,000 sqm Number of Stories : 66 Building Height : 450m Architect : Skidmore, Owings & Merrill LLP • Location : Ninjing, China

• Triangular • Advantages • - form relates to its site, providing stunning views of the nearby mountains, lake, and historical buildings. • - serrated façade treatment is interesting . • - adding depth and texture to the imposing form while allowing natural ventilation .

• 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.

• 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 enger elevators from the ground floor entrance lobby to the level 36 sky lobby, where five local engers lifts will take guest up to the highest hotel level on 65.

1. 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.

2. The tower features a unique façade system, rather than a typical flush-glass curtain wall system; it is composed of offset modular s that protrude in plan to create a distinctive texture to the building’s 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 with a hidden operable 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 , 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