Test and improve your knowledge of skyscrapers.
A skyscraper is a tall, continuously habitable building of many floors, usually designed for office, commercial and residential use. There is no official definition or height above which a building may be classified as a skyscraper and at which height it may not be considered a high-rise anymore. Buildings taller than 1000' are classified as Supertall. Buildings taller than 2000' are classified as Megatall.
One common feature of skyscrapers is having a steel framework that supports curtain walls. These curtain walls either bear on the framework below or are possibly suspended from the framework above, rather than load-bearing walls of conventional construction. Some early skyscrapers have a steel frame that enables the construction of load-bearing walls taller than of those made of reinforced concrete. Modern skyscrapers' walls are not load-bearing and most skyscrapers are characterized by large surface areas of windows made possible by the concept of steel frame and curtain walls. However, skyscrapers can have curtain walls that mimic conventional walls and a small surface area of windows. Modern skyscrapers often have a tubular structure, and are designed to act like a hollow cylinder to resist lateral loads (wind, seismic, etc.).
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