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11/13/2013

One World Trade Center Officially U.S.’s Tallest Building

 
One World Trade Center beats out Willis Tower for tallest building in the U.S.

Chicago’s Willis Tower can no longer lay claim to being the tallest building in the U.S.

The Council on Tall Buildings and Urban Habitat convened its Height Committee to rule on the official height of One World Trade Center (1WTC) in New York. The committee reached a consensus that the New York building’s height to its architectural top is 1,776 feet.

The two issues regarding the true height of the building were:

  • The nature of the mast structure on top of the tower.
  • The datum line (bottom point) from which the height to architectural top was determined.

Due to design changes that resulted in the removal of the architectural cladding around the mast at the top of the structure, it became unclear whether the structure was in fact a “spire” – a vertical element that completes the architectural expression of the building and is intended as permanent, or whether it was an antenna – a piece of functional-technical equipment that was subject to change.

The spire-antenna distinction makes a difference in the measurement of “height to architectural top,” which includes spires but does not include antennae, signage, flag poles or other functional-technical equipment. Determining the topmost structure to be “functional-technical” potentially could have significantly impacted 1WTC’s ranking against other buildings, as the next obvious point to take a measurement of “architectural top” would have been the building’s roof slab, at 1,334 feet, 8 inches – 441 feet, 4 inches lower than claimed.

“We were very satisfied with the detailed information presented by the team, in particular, that which affirmed that the structure on top of the building is meant as a permanent architectural feature, not a piece of functional-technical equipment,” said Timothy Johnson, Chairman of CTBUH and Design Partner at NBBJ.

The second issue at 1WTC was the location from which the 1,776-foot measurement had been taken. The building has four entrances, one on each side. Three of those entrances are flush with the 9/11 Memorial Plaza, which is level with the base of the original World Trade Center towers. These three entrances lead directly into the elevator lobby, while a fourth entrance is 5 feet, 8 inches lower than the lobby, on Vesey Street, due to the change in grade from south to north. If measured from this point, the height to architectural top would have been 1,781 feet, 8 inches.

A presenter showed plans indicating that the main entrance of the building was the south entrance facing the 9/11 Memorial plaza, and that the north entrance at the lower elevation does not provide direct access to the elevators, but requires negotiating steps or using a disabled-access lift to ascend to the lobby. To be considered “significant,” an entrance must “be predominantly above existing or pre-existing grade and permit access to one or more primary uses in the building via elevators.” Therefore, the lower Vesey Street (north) entrance was not considered “significant” by the committee.


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Upon completion, the building is expected to be the world’s third tallest building.

 

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04/16/2014

The U.S. Army plans to start development of a solar array that will provide about 25% of the annual installation electricity requirement of Fort Huachuca, Arizona.

04/15/2014

The EPA's annual greenhouse gas emissions report is now available.

04/14/2014

Are you what some would call a “climate-change denier”? If so, you'll want to read this.

04/10/2014
Los Angeles has remained the top city for ENERGY STAR certified building since 2008, while Washington, D.C. continues to hold onto second place for the fifth consecutive year, according to a new list released by the EPA.
04/09/2014
Green construction has grown massively over a short period of time.
04/07/2014
Field demonstrations of newly proven energy-efficient technologies are yielding valuable results for the U.S. Navy, helping it meet energy goals.
04/03/2014
Building owners in Chicago now have more options when it comes to getting their building energy data verified.
04/01/2014
According to a new report from Eaton, such outages are up 15% in 2013 over 2012 and over half of those surveyed believe that downtime could have been prevented.
03/31/2014
The newly revised ANSI/ASHRAE Standard 105-2014, Standard Methods of Determining, Expressing, and Comparing Building Energy Performance and Greenhouse Gas Emissions, aims to provide a consistent method of measuring, expressing, and comparing the energy performance of buildings.
03/27/2014
Facility managers face an every expanding array of sustainability choices and challenges, but for the next generation of FMs, green practices could be second nature as sustainability literacy enters the K-12 school system.
03/25/2014
While the economic recession explains the decline in sales in 2008 and 2009, it is much less clear why sales have continued to fall.
03/24/2014
University of Washington (UW) scientists have built the thinnest known LED that can be used as a source of light energy in electronics.
03/21/2014
Mississippi Governor Phil Bryant signed Senate Bill 2378 into law, effectively enacting the state’s first building code.
03/19/2014
In an attempt to improve building energy performance, the DOE’s National Renewable Energy Laboratory has released a web-based tool called the Technology Performance Exchange, or TPEx.
03/18/2014
Could green building practices pose unanticipated life-safety hazards?
03/13/2014
Worried about workplace violence in your facility? Researchers have discovered that “mindfully observing” high-risk employees can avert danger and workplace violence.
03/11/2014
Through the DOE’s Building Energy Codes Program, every dollar the DOE has spent on building energy codes over the past two decades has resulted in $400 in energy cost savings.
03/07/2014
It is possible to harvest energy from Earth's thermal infrared emission into outer space, according to new research from the Harvard School of Engineering and Applied Sciences.
03/05/2014
Is your building prepared to handle an emergency?
03/04/2014
NASCAR revealed five newly installed charging stations for employee use.
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