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Collapse Of The World Trade Center
The collapse of the World Trade Center occurred during the terrorist attacks of September 11, 2001, after the Twin Towers were struck by two hijacked commercial airliners. One World Trade Center (WTC 1, or the North Tower) was hit at 8:46 a.m. Eastern time and collapsed at 10:28 a.m. Two World Trade Center (WTC 2, or the South Tower) was hit at 9:03 a.m. and collapsed at 9:58 a.m. The resulting debris severely damaged or destroyed more than a dozen other adjacent and nearby structures, ultimately leading to the collapse of 7 World Trade Center at 5:21 p.m. A total of 2,763 people were killed in the crashes, fires, and subsequent collapses, including 2,192 civilians, 343 firefighters, and 71 law enforcement officers as well as all the passengers and crew on the airplanes, which included 147 civilians and the 10 hijackers. In September 2005, the National Institute of Standards and Technology (NIST) published the results of its investigation into the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WTC Collapse Before And After
WTC may stand for: Buildings *World Trade Center (other) **World Trade Center (1973–2001) in New York, a seven-building complex in Lower Manhattan that was destroyed in the September 11, 2001 attacks **World Trade Center (2001–present), a complex in New York under construction to replace the former World Trade Center *Warrenton Training Center, a classified U.S. government complex in Virginia Arts, entertainment, and media *''The Well-Tempered Clavier'', a collection of preludes and fugues for keyboard by Johann Sebastian Bach *When They Cry (other), a Japanese video game series *Waking the Cadaver, a slam death metal band based out of New Jersey *Wu-Tang Clan, an American hip-hop group Education *West Toronto Collegiate, a former public high school in Toronto, Ontario, Canada *Western Technical College, a vocational-technical school in La Crosse, Wisconsin *Westminster Theological Centre, a UK-based accredited theological college Other uses *ICC World Te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
One World Trade Center
One World Trade Center (also known as One World Trade, One WTC, and formerly Freedom Tower) is the main building of the rebuilt World Trade Center complex in Lower Manhattan, New York City. Designed by David Childs of Skidmore, Owings & Merrill, One World Trade Center is the tallest building in the United States, the tallest building in the Western Hemisphere, and the seventh-tallest in the world. The supertall structure has the same name as the North Tower of the original World Trade Center, which was destroyed in the terrorist attacks of September 11, 2001. The new skyscraper stands on the northwest corner of the World Trade Center site, on the site of the original 6 World Trade Center. It is bounded by West Street to the west, Vesey Street to the north, Fulton Street to the south, and Washington Street to the east. The construction of below-ground utility relocations, footings, and foundations for the new building began on April 27, 2006. One World Trade Center b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
B-25 Bomber
The North American B-25 Mitchell is an American medium bomber that was introduced in 1941 and named in honor of Major General William "Billy" Mitchell, a pioneer of U.S. military aviation. Used by many Allied air forces, the B-25 served in every theater of World War II, and after the war ended, many remained in service, operating across four decades. Produced in numerous variants, nearly 10,000 B-25s were built. These included several limited models such as the F-10 reconnaissance aircraft, the AT-24 crew trainers, and the United States Marine Corps' PBJ-1 patrol bomber. Design and development The Air Corps issued a specification for a medium bomber in March 1939 that was capable of carrying a payload of over at North American Aviation used its NA-40B design to develop the NA-62, which competed for the medium bomber contract. No YB-25 was available for prototype service tests. In September 1939, the Air Corps ordered the NA-62 into production as the B-25, along with the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
UA Flight 175 Hits WTC South Tower 9-11 Edit
UA, U-A, Ua, uA, or ua may refer to: Arts and entertainment Gaming * ''Unearthed Arcana'', a Dungeons & Dragons sourcebook * ''Unknown Armies'', a role playing game * ''Urban Assault'', a first-person shooter and real-time strategy computer game Music * Ua (singer), Ua (born 1972), a Japanese singer-songwriter * ''United Abominations'', an album by the band Megadeth Other uses in arts and entertainment * United Artists, a film studio * ''The Umbrella Academy'', a graphic novel by Gerard Way Businesses and organizations * ''Uitgesloten aansprakelijkheid'' (lit. "excluded liability"), a Dutch form of cooperative, which has legal personality, but with members (at least two on incorporation) rather than shareholders, with no capital and therefore no minimum capital or equity requirement, and with articles of association that can be worded such that members are not liable for the actions performed by the Cooperative (or losses suffered), usually used as a holding or finance comp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WTC Towers Hat Truss Framing At The Roof Level
WTC may stand for: Buildings *World Trade Center (other) **World Trade Center (1973–2001) in New York, a seven-building complex in Lower Manhattan that was destroyed in the September 11, 2001 attacks **World Trade Center (2001–present), a complex in New York under construction to replace the former World Trade Center *Warrenton Training Center, a classified U.S. government complex in Virginia Arts, entertainment, and media *''The Well-Tempered Clavier'', a collection of preludes and fugues for keyboard by Johann Sebastian Bach *When They Cry (other), a Japanese video game series *Waking the Cadaver, a slam death metal band based out of New Jersey *Wu-Tang Clan, an American hip-hop group Education *West Toronto Collegiate, a former public high school in Toronto, Ontario, Canada *Western Technical College, a vocational-technical school in La Crosse, Wisconsin *Westminster Theological Centre, a UK-based accredited theological college Other uses *ICC World Te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viscoelasticity
In materials science and continuum mechanics, viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. Viscous materials, like water, resist shear flow and strain linearly with time when a stress is applied. Elastic materials strain when stretched and immediately return to their original state once the stress is removed. Viscoelastic materials have elements of both of these properties and, as such, exhibit time-dependent strain. Whereas elasticity is usually the result of bond stretching along crystallographic planes in an ordered solid, viscosity is the result of the diffusion of atoms or molecules inside an amorphous material.Meyers and Chawla (1999): "Mechanical Behavior of Materials", 98-103. Background In the nineteenth century, physicists such as Maxwell, Boltzmann, and Kelvin researched and experimented with creep and recovery of glasses, metals, and rubbers. Viscoelasticity was further examined in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Composite Construction
Composite construction is a generic term to describe any building construction involving multiple dissimilar materials. Composite construction is often used in building aircraft, watercraft, and building construction. There are several reasons to use composite materials including increased strength, aesthetics, and environmental sustainability. Structural engineering In structural engineering, composite construction exists when two different materials are bound together so strongly that they act together as a single unit from a structural point of view. When this occurs, it is called composite action. One common example involves steel beams supporting concrete floor slabs. If the beam is not connected firmly to the slab, then the slab transfers all of its weight to the beam and the slab contributes nothing to the load carrying capability of the beam. However, if the slab is connected positively to the beam with studs, then a portion of the slab can be assumed to act composit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chamfer
A chamfer or is a transitional edge between two faces of an object. Sometimes defined as a form of bevel, it is often created at a 45° angle between two adjoining right-angled faces. Chamfers are frequently used in machining, carpentry, furniture, concrete formwork, mirrors, and to facilitate assembly of many mechanical engineering designs. Terminology In machining the word '' bevel'' is not used to refer to a chamfer. Machinists use chamfers to "ease" otherwise sharp edges, both for safety and to prevent damage to the edges. A ''chamfer'' may sometimes be regarded as a type of bevel, and the terms are often used interchangeably. In furniture-making, a lark's tongue is a chamfer which ends short of a piece in a gradual outward curve, leaving the remainder of the edge as a right angle. Chamfers may be formed in either inside or outside adjoining faces of an object or room. By comparison, a ''fillet'' is the rounding-off of an interior corner, and a ''round'' (or ''radiu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wtc Floor Truss System
WTC may stand for: Buildings *World Trade Center (other) **World Trade Center (1973–2001) in New York, a seven-building complex in Lower Manhattan that was destroyed in the September 11, 2001 attacks **World Trade Center (2001–present), a complex in New York under construction to replace the former World Trade Center *Warrenton Training Center, a classified U.S. government complex in Virginia Arts, entertainment, and media *''The Well-Tempered Clavier'', a collection of preludes and fugues for keyboard by Johann Sebastian Bach *When They Cry (other), a Japanese video game series *Waking the Cadaver, a slam death metal band based out of New Jersey *Wu-Tang Clan, an American hip-hop group Education *West Toronto Collegiate, a former public high school in Toronto, Ontario, Canada *Western Technical College, a vocational-technical school in La Crosse, Wisconsin *Westminster Theological Centre, a UK-based accredited theological college Other uses *ICC World Te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tube (structure)
In structural engineering, the tube is a system where, to resist lateral loads (wind, seismic, impact), a building is designed to act like a hollow cylinder, cantilevered perpendicular to the ground. This system was introduced by Fazlur Rahman Khan while at the architectural firm Skidmore, Owings & Merrill (SOM), in their Chicago office. The first example of the tube's use is the 43-story Khan-designed DeWitt-Chestnut Apartment Building, since renamed Plaza on DeWitt, in Chicago, Illinois, finished in 1966. The system can be built using steel, concrete, or composite construction (the discrete use of both steel and concrete). It can be used for office, apartment, and mixed-use buildings. Most buildings of over 40 stories built since the 1960s are of this structural type. Concept The tube system concept is based on the idea that a building can be designed to resist lateral loads by designing it as a hollow cantilever perpendicular to the ground. In the simplest incarnation of the t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chicago
(''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = Country , subdivision_name = United States , subdivision_type1 = State , subdivision_type2 = Counties , subdivision_name1 = Illinois , subdivision_name2 = Cook and DuPage , established_title = Settled , established_date = , established_title2 = Incorporated (city) , established_date2 = , founder = Jean Baptiste Point du Sable , government_type = Mayor–council , governing_body = Chicago City Council , leader_title = Mayor , leader_name = Lori Lightfoot ( D) , leader_title1 = City Clerk , leader_name1 = Anna Valencia ( D) , unit_pref = Imperial , area_footnotes = , area_tot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Willis Tower
The Willis Tower (originally the Sears Tower) is a 108-story, skyscraper in the Loop community area of Chicago in Illinois, United States. Designed by architect Bruce Graham and engineer Fazlur Rahman Khan of Skidmore, Owings & Merrill (SOM), it opened in 1973 as the world's tallest building, a title that it held for nearly 25 years. It is currently the third-tallest building in the Western Hemisphere, as well as the 23rd-tallest in the world. Each year, more than 1.7 million people visit the Skydeck observation deck, the highest in the United States, making it one of Chicago's most popular tourist destinations. The building occupies a site bounded by Franklin Street, Jackson Boulevard, Wacker Drive, and Adams Street. Graham and Khan designed the building as nine square "tubes", clustered in a 3×3 matrix; seven of the tubes set back at upper floors. The tower has 108 stories as counted by standard methods, though the building's owners count the main roof as 109 and the mec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
