Free video about skyscrapers. This free video was created for you by http://epsos.de and can be used for free under the creative commons license with the attribution of epSos.de as the original author of this skyscrapers video. Thank you for supporting the creative commons movement !! Skyscraper is a building tall, continuously habitable for many stories, often designed for office and commercial use. There is no official definition or a minimum height for a building can be classified as a skyscraper. A common feature of skyscrapers is to have a structure of steel supporting the external walls, which serve as a coating instead of the structural walls of conventional buildings. Some of the first skyscrapers have a steel frame that allows the construction of structural walls higher than those made ​​of reinforced concrete. Walls of modern skyscrapers are not made ​​to support the weight of the structure and most of the skyscrapers are characterized by large surface areas of windows, which are only made ​​possible by the use of the steel structure and wall coating. However, the skyscrapers may have walls that mimic conventional walls and a small surface area of windows. Today, skyscrapers are something increasingly common where land is expensive, as in the centers of big cities because they provide a high proportion of lettable space by land area. They are built not just for economy of space, but as well as temples and palaces of the past, skyscrapers are considered symbols of economic power of a city or a country. They not only define the horizon as help define the identity of a city. In some cases, exceptionally tall skyscrapers were built not by necessity, but to help define the identity and power projection of the city where it was built. Note also that the appropriation of the "skyscrapers" format by eclecticism and the Art Deco was an important element in the definition of these styles in the United States and especially in New York and Chicago. The association between art deco and the skyscrapers was so strong at certain times that generated clones of New Yorkers buildings in other parts of the world: Altino Arantes Building in São Paulo, albeit with relatively small height front to their peers in the United States, can be seen this way. Amsterdam in 1931 has long known as "Skyscraper city" and this also applies to the 97 meter high Boerentoren tower in Antwerp. If a building skyline determines it will generally get the predicate skyscraper in the Netherlands nowadays this is usually the case with high-rises above 100 meters. Because skyscrapers per square meter of useful space relatively little soil occupy such complex structures are put down in areas with high land prices such as Manhattan or Hong Kong. Important technical factors in the history of skyscrapers include the development of the elevator and the application of high-grade steel and concrete. In the first place, a building distinguished by the fact that it is used by people to live and work. Skyscrapers are usually structural solitaires with turmartigem character and high urban planning autonomy. These features and the high altitude make it a special form of the skyscraper - a term common to all buildings with a height of over 22 meters or more than about 6-7 storeys applies. On 17 January 2009, reached Burj Khalifa its structural and official final height of 828 meters and is with its 830 meters height to tip not only the tallest skyscraper, but also the world's tallest building ever built. Thus it was since the establishment of the Empire State Building for the first time that the title of highest building went back to a skyscraper. The building was opened on 4 January 2010. In Europe, in December 2003 sparked the Triumph-Palace in Moscow with 264 meters and 54 floors to 56 floors with 259 meters high Commerzbank Tower in Frankfurt am Main on the first place of the ranking of the tallest building in Europe from. The title was in 2007 in the 268 meters with its slightly higher Naberezhnaya Tower C. since the year 2012 is the 310 meter high skyscraper The Shard in London in the first place on the continent. In 2009 Beijing was built with the 234 meter high building of China Central Television Headquarters of the architect Rem Koolhaas, a new form of skyscraper in the form of a stirrup or a bow. This design was equally as important, although this building contributed to its comparatively low height to any record. Thank you for supporting the creative commons movement !!

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