TALL BUILDING STRUCTURES
Hearst
Tower
Umut Balaban
020170002
Hearst Tower
Located in New York, US
Architect = Norman Foster
Completed in 2006
Footprint = 1800 square meters
Cost = $500 million
Height = 182 meters
Floors= 46
New York City’s first LEED Gold
Skyscraper
BACKGROUND
International Magazine Building was designed by Joseph Urban
as the headquarters for the Hearst Corporation.
The construction was completed in 1928.
The building was housed the 12 magazines Hearst owned at the
time. It had six stories and stone facade.
The construction costed $2 million.
The cast stone construction was retained with fluted columns.
Construction of additional stories on the six-story base was
thought in 1946, but not executed.
In 2001, the Hearst Corporation prefered to assemble the
offices in a new tall building.
Foundation
Separate foundation system from existing building was used. Spread Caissio
Footing n
There are large elevation differences of the bedrock under site up to 10 meters.
Half of the tower was supported on spread footings.
Half of the tower was supported on caissons.
Mega Column and Super Diagonal System
Mega columns are made out of built-up steel tube sections and filled
with concrete.
They are located at the exterior of the new tower.
Mega columns are continued down to the foundation from 10th floor.
They carry gravity loads of tower to ground and provide lateral stability.
Super diagonal sytem allows for open interior atrium with 25 meters height.
Diagrid System
Perimeter Diagonal Structure
Diagonal members eliminate vertical columns.
Node
Intersection node for diagonal and beam
Ring Beam
It connects diagonal and edge beam
Floor Slab
It connects diagonal to reach stability
Service Core
Vertical core resists gravity load
Ground
Concentrated load distribution
Node
Complex nodes bolted into six different 30 cm H-column-type diagrid
elements
Prefabricated off-site and bolted in place.
Half of the tower was supported on spread footings.
Floor System
It is comprised of steel and concrete.
It behaves like one way slabs.
Shorter interstitial members were placed between floor beams on two
sides of tower for lateral support.
Plans
Sustainability
Hearst Tower is New York's first LEED Gold commercial officebuilding.
The efficient structural diagrid system uses 12,000 tons of steel.
This system was composed of eighty five percent recycled steel.
Using natural light in the tower reduces environmental costs.
Hearst Tower remains at a comfortable temperature for a majority of
the year by natural ventilation.
The basement houses a 53000 liter reservoir that collects rainfall.
20% less steel was consumed than the conventional skyscrapers.
