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File:Burj Khalifa.jpg
The Burj Khalifa, in Dubai (United Arab Emirates), has been the tallest skyscraper in the world since 2009, with a height of 829.8 m.

A skyscraper is a tall, continuously habitable building of over 40 floors, mostly designed for office, commercial and residential uses. A skyscraper can also be called a high-rise, but the term skyscraper is often used for buildings higher than {{safesubst:#invoke:convert|convert}}. For buildings above a height of {{safesubst:#invoke:convert|convert}}, the term Supertall can be used, while skyscrapers reaching beyond {{safesubst:#invoke:convert|convert}} are classified as Megatall.<ref name="CTBUH">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

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 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.). To appear more slender, allow less wind exposure and to transmit more daylight to the ground, many skyscrapers have a design with setbacks.


Skyscraper sections
Intro  Definition  History  Design and construction  Economic rationale  Environmental impact   History of the tallest skyscrapers   Cancellation  Future developments  See also  References   Further reading    External links   

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