User:Aude/9-11 attacks

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September 11, 2001 attacks

I'm working to improve articles relating to the September 11, 2001 attacks, with the goal of getting some up to featured status. ("best of Wikipedia") Current efforts include the World Trade Center article, and related subarticles. So far, two are featured articles: Construction of the World Trade Center and 7 World Trade Center, while Port Authority of New York and New Jersey is a good article. Also working on American Airlines Flight 77, Planning of the September 11, 2001 attacks, and other articles.

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Featured article

The new 7 World Trade Center

7 World Trade Center is the name of two buildings in New York City, located in Lower Manhattan across from the World Trade Center site. The original building, developed by Larry Silverstein in the 1980s, was 47 stories tall, clad in red exterior masonry, and occupied a trapezoid-shaped footprint. The building was constructed above a Con Edison power substation, which imposed some unique structural design constraints. An elevated walkway connected the building to the World Trade Center plaza. The original building opened in 1987 and had difficulties attracting tenants at first. In 1988, the Salomon Brothers signed a long-term lease, and became the main tenants of the building. During the September 11, 2001 attacks, this original structure was heavily damaged by debris when the adjacent twin towers collapsed. Its structural integrity was further compromised by fire, and the combined effect of structural damage and fire resulted in its collapse at 5:20 p.m. on September 11. By 2002, construction of a replacement building was underway. The new building, completed in 2006, is 52 stories and also is above a power substation. It was built on a smaller footprint than the original to allow Greenwich Street to be restored from TriBeCa through the World Trade Center site and south to Battery Park. The new building is bounded by Greenwich, Vesey, Washington, and Barclay streets. A small park across the street, between Greenwich and West Broadway, occupies space that was part of the original building's footprint. The new building's design placed emphasis on safety, with a reinforced concrete core, wider stairways, and thicker fireproofing of steel columns. The new 7 World Trade Center also has numerous environmentally friendly features, which enabled it to gain gold status in the U.S. Green Building Council's LEED program. (more...)

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Featured article

View of the World Trade Center's construction from across the Hudson river

The building of the World Trade Center started as a post-World War II urban renewal project, spearheaded by David Rockefeller, to help revitalize Lower Manhattan. The project was developed by the Port Authority of New York and New Jersey, which hired architect Minoru Yamasaki who came up with the specific idea for twin towers. The towers were designed as framed tube structures, which provided tenants with open floor plans, uninterrupted by columns or walls. This was accomplished using numerous, closely-spaced perimeter columns to provide much of the strength to the structure, along with gravity load shared with the core columns. The elevator system, which made use of sky lobbies and a system of express and local elevators, allowed substantial floor space to be freed up for use as office space by making the structural core smaller. The design and construction of the World Trade Center twin towers involved many other innovative techniques, such as the slurry wall for digging the foundation, and wind tunnel experiments. Construction of the World Trade Center's North Tower began in August 1968, and the South Tower in 1969. Extensive use of prefabricated components helped to speed up the construction process. The first tenants moved into the North Tower in December 1970 and into the South Tower in January 1972. Four other, low-level buildings were constructed as part of the World Trade Center in the 1970s, and a seventh building was constructed in the mid-1980s. (more...)
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