One World Trade Centre

Prepared By:Sheetal Pimparwar

Location

Location

• At the heart of the tri - state transportation network

• The World Trade Center development links seamlessly to the metropolitan area’s, local and regional transport services.

• It provides quick and easy access to the region’s three international airports, as well as a full range of rail services.

• With the completion of World Trade Center Transportation Hub, the World Trade Center offers unsurpassed downtown access, connecting to eleven subway lines, PATH(rapid transit railroad service) and Hudson River ferries.

• The One World Trade Center lobby features street-level entrances on three sides. It also provides quick and convenient access to the Transportation Hub and retail concourses.

Transportation Network

Project FactsLocation: New YorkProject Completion : 2014Site Area : 75,000 sq.ftProject Area : 35,00,000 sq.ftNumber of Stories : 102Building Height : 1776 ftBuilding type: Commercial + office (Mixed use)Construction Material : Concrete, Steel

ABOUT:• The tallest skyscraper in the Western Hemisphere

stands at a symbolic 1,776 feet.

• 3 million square feet Class (A) office space.

• There are 70 elevators in the building

• 3 observation floors (100,101,102)• Parking, Broadcast and antenna facilities: Supported

by both above and below ground mechanical infrastructure

• Below ground: - tenant parking & storage, shopping

- access to the PATH, subway

trains & world financial centre

Design

Lobby

• A 65-feet (20 m) high public lobby, topped by a series of mechanical floors, form a 200-feet (61 m)-per-side visual cubic base to the tower.

• The next 69 floors, providing tenant office space, rise above the base to an elevation of 1,150 feet (350 m).

• Mechanical and observation floors culminate in a rooftop observation deck at 1,362 feet (415 m) with a glass parapet extending to 1,368 feet (417 m) - the heights of the original Twin Towers.

• A shrouded antenna structure supported by cables, rises to a total height of 1,776 feet (541 m), which is a tribute to the year the United States Declaration of Independence was signed.

Cubic Base

Design

• Cable-net glass is used for facades on all four sides of the building. They measure 60 feet high and range in width from 30 feet on east and west sides (for access to the observation deck) to 50 feet on the north side and 70 feet on the south for primary tenant access.

• As the tower itself rises from this cubic base, its square edges are chamfered back, transforming the square into eight tall isosceles triangles in elevation, or an elongated square antiprism.

• At its middle, the tower forms a perfect octagon in plan and then culminates in a glass parapet (elevation 1,362 feet (415 m) and 1,368 feet (417 m) whose plan is a square, rotated 45 degrees from the base.

• A mast containing the antenna for television broadcasters is secured by a system of cables, and rises from a circular support ring, similar to the Statue of Liberty's torch, to a height of 1,776 feet (541 m).

• Above the mast will be an intense beam of light that will be lit at night and will likely be visible over 1,000 feet (300 m) into the air above the tower.

Stack Plan

VESEY STREET

VESEY STREET

FLATON STREET

Ground Floor

View of West plaza

Entrance

Floor

• The tower’s structure is designed around a massive, redundant steel moment frame consisting of beams and columns connected by a combination of welding and bolting.

• Paired with a massive concrete core shear wall, the moment frame lends substantial rigidity and redundancy to the overall building structure while providing column free interior spans

Column Free interior Structural Steel Moment frame at the tower perimeter

Structural design

3.0 million RSF of Class A office space• 55 ft high main lobby accessible from three frontages and

connected to the underground transportation network• Double-height sky lobby for access to upper floors• Column-free floor plates• 45 ft maximum core-to-window depth, 30 ft perimeter column

module, 5 ft curtain wall module• 13 ft, 4 inch slab-to-slab• Minimum finished ceiling heights of 9 ft• 54 high-speed destination dispatch elevators• 5 service cars serve all office floors• Central service corridor and limited core penetrations eliminate the

need for an inefficient second interior path of circulation• 2 tenant-controlled DX units per floor• 10 escalators

Building Features

Curtain Wall• Curtain wall begins at 20th floor and continues to

the observation deck.

• Based on a 1.52x 4.0 m2 module, the panels are floor – to- floor, high- performance, insulated units weighing in as much as 2720 kgs each.

• The units at the 20th floor are the heaviest due to blast-resistance requirements which make them thicker and heavier.

Designed to achieveLEED CS Gold

– 90% of occupied spaces use natural light– 21% energy reduction– 100% renewable energy– 30% reduction in municipal water consumption– 100% storm water recycled– High-quality filtered air– High-performance curtain wall

Structural redundancy– 14,000 psi steel-reinforced concrete core enclosing all life safety equipment and paths of egress– Extra-wide pressurized and protected egress stairs– Emergency generator backup for life safety and critical systems– Steel moment frame– Alternative structural load paths– Interconnected internal stairs with alternative paths of egress leading directly to the street-24/7 electronic access, campus-wide integratedswitch plan

• Safety features will include 3 feet thick reinforced concrete walls for all stairwells, elevator shafts, risers, and sprinkler systems; extremely wide "emergency stairs"; a dedicated set of stairwells exclusively for the use of firefighters; and biological and chemical filters throughout its ventilation system.

Life Safety Features

Spire• The spire performs multiple functions, most of which

involves broadcasting and digital communication.• It’s a hybrid structure consisting of 2 major

components: a 137 meter spire and a 3 level communications platform ring.

• At the base of the spire, the circular lattice ring supports electronic news gathering antennas and communication antennas.

• To add more support cables are connected from the mast back to ring.

• Large helical channel, called strakes are built into the geometry of radome and wrap around the antenna to direct wind up and away from the structure.

References• http://skyscraperinfo-bradds31.blogspot.in/2011/07/one-world-trade-centre-desig

n.html• https://www.youtube.com/watch?v=AVn2veKiqV4• http://www.designbuild-network.com/projects/freedom-tower-ny/• http://onewtc.com/upload/downloads/1WTC_PDFBrochure.pdf• http://www.panynj.gov/wtcprogress/index.html• http://en.wikipedia.org

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