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LOGO
VERTICAL CITYVERTICAL CITYCASE STUDY: NAKHEEL TOWER
Sandhya Ravindran
Under the guidance of: Dr. P.L.VIJAYAKUMARI
INTRODUCTION
Takenaka Corporation, Japan proposed the concept of “VERTICAL CITIES”
A futuristic tower, called the X-Seed 4000 has been designed as an ecological structure of about 4000 meters high in Tokyo, Japan!
Solar Energy would power the X-Seed 4000 which could house between 500 000 to 1 million people. The projected cost of a building like this has been estimated between 300 to 900 billion dollars.
DEFINITION :
A vertical city ,true to its name, is a very tall
mixed use development combining offices, a 5-star
hotel, luxury residential and serviced apartments,
an experience centre and observation facilities
along with a special sky function space creating a
vertical community of over 15,000 people.
Contents
1. Case study: Nakheel Tower
2. Structure
3. Architecture
4. Materials for construction
5. Environmental Aspects
6. Hindrance
7. Conclusion
Nakheel Tower
Nakheel Tower in itself will be a vertical city, accommodating residents in an efficient LEED rated, sustainable building.
This is the world’s first true,very tall mixed use development combining offices.
The global architecture practice believes that the design for the 270 hectare masterplan and more than 1 kilometre-high tower will provide the centrepiece for the future of Dubai's development.
STRUCTURE
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Structure
Structural FormBuilding Form
Primary Structural Elements
Wind Engineering
Stack Effect
Building Services
STRUCTURE
Building Form
To gain an adequate footprint for stability, the tower extends to nearly 100m in diameter, resulting in a 10:1 aspect ratio.
A central void space in the tower pushed all of the usable area to the perimeter.
4 quadrant approach –independent and redundant building systems of all kinds-structural, mechanical, electrical, fire egress, fire safety etc.
At every 25 levels,the tower legs are bound together by sky bridges.
•Four distinct means of exiting during emergency•Functioning as communities•As a belt truss •Lift zones•Delineate the different uses of the building
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STRUCTURE
Structural Form
Maintain a uniform distribution of load throughout the structure.
Elements are sized based on strength considerations, while at the same time providing sufficient lateral stiffness.
Materials perform double-duty (gravity and lateral support).
Multiple load paths are created to give added redundancy and by placing material only where it is required for strength.
STRUCTURE
Primary Structural Elements
Drum Wall,analogous with a typical building’s central core wall.
Hammer Walls spring outwards to engage the structure at the perimeter.
Fin Walls spring inward primarily to support the core area
Link Walls tie the Drum Wall segments together
STRUCTURE
Wind Engineering
The slots serve to mitigate the vortex-shedding
Cut into 4 towers
Wind passes freely through the buiding thereby reducing the resistence.
STRUCTURE
Logistics
Serviced by 156 lifts using double-deck and express lifts
Delivery is via remote loading and docking.
Internal lift shafts are to be used for construction lifts
Use of pre-assembled components
STRUCTURE
Stack Effect
A warm building in a cold climate behaves like a chimney
Problems occur during hot weather, with the pressure gradient operating in reverse.
The pressure created by stack effect causes air infiltration into the building at the high level, resulting in energy loss and loss of capacity of HVAC systems
Measures to mitigate Stack Effect
Provide anti-rooms
Revolving doorsIsolating docks
Multiple stages to entries
Pressure control for goods access
MATERIALS OF CONSTRUCTION
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Overall weight of the structure should be less.
For the Nakheel Tower, concrete in excess of 100MPa strength is required with Young’s Modulus of nearly 50,000MPa.
Work on the concrete design was undertaken during schematic design.
Total volume of concrete will be 500,000 m3
ENVIRONMENTAL ASPECTS
Water
Energy
Materials
•Water conservation is by black water treatment, storm water harvesting and reuse of fire test water.
•Thermal wind generator farms will be set to create all the energy that would be needed.
.
•Use of high performance facades to low energy use servicing
HINDRANCES
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Intricate detailing
Advanced Logistics
Affects the Auto Industry
Induces seismic activities
SOME STAGGERING FACTS
• All of the reinforcing bars laid end to end could stretch from Dubai to New York (1/4 of the way around the world)
The building experiences five different microclimatic conditions over its height
The temperature in the atmosphere at the top of the building can be as much as 10 degrees cooler than the bottom
Due to the high speed shuttle lifts one may be able to see the sunset twice from the bottom and again from the top of the building
The goal is to achieve the highest LEED certification
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AQUA,USA
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Ripple/jelly effect created by variously sized balconies from top to bottom.
THE CHICAGO SPIRE
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Modelled on the image of a giant drill poking through the ground.
THE BURJ DUBAI
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When completed next year it will be the tallest man-made structure in the world and the tallest building by a long shot with a predicted height of 818m