A high-rise is a tall building or structure. Normally, the function of the building is added, for example "high-rise apartment building" or "high-rise offices".

High-rise buildings became possible with the invention of the elevator (lift) and cheaper, more abundant building materials. Buildings between convert|75|ft|m and 491 feet (23 m to 150 m) high are, by some standards, considered high-rises. Buildings taller than 492 feet (150 m) are classified as skyscrapers. The average height of a level is around 13 feet (4 m) high, thus a 79 foot (24 m) tall building would comprise 6 floors.

The materials used for the structural system of high-rise buildings are reinforced concrete and steel. Most American style skyscrapers have a steel frame, while residential tower blocks are usually constructed out of concrete.

Although the exact definition is immaterial, various bodies have tried to define what 'high-rise' means:

*The "International Conference on Fire Safety in High-Rise Buildings" defined a high-rise as "any structure where the height can have a serious impact on evacuation"
*The "New Shorter Oxford English Dictionary" defines a high-rise as "a building having many stories".
*Massachusetts General Laws define a high-rise as being higher than 70 feet (21 m).
*Most building engineers, inspectors, architects and similar professions define a high-rise as a building that is at least 75 feet (23 m) tall.

High-rise structures pose particular design challenges for structural and geotechnical engineers, particularly if situated in a seismically active region or if the underlying soils have geotechnical risk factors such as high compressibility or bay mud. They also pose serious challenges to firefighters during emergencies in high-rise structures. New and old building design, building systems like the building standpipe system, HVAC systems (Heating, Ventilation and Air conditioning), fire sprinkler system and other things like stairwell and elevator evacuations pose significant problems.

High-rise apartment buildings had already flourished in antiquity: the insulae in ancient Rome and several other cities in the Roman Empire, some of which might have reached up to 10 or more stories, [Gregory S. Aldrete: "Daily Life in the Roman City: Rome, Pompeii and Ostia", 2004, ISBN 9780313331749, p.79f.] one reportedly having 200 stairs. [Martial, Epigrams, 27] Because of the destruction caused by poorly-built high-rise insulae collapsing, [Gregory S. Aldrete (2004), "Daily Life in the Roman City: Rome, Pompeii and Ostia", p. 78, ISBN 9780313331749] several Roman emperors, beginning with Augustus (r. 30 BC - 14 AD), set limits of 20-25 metres for multi-story buildings, but met with limited success, [Strabo, 5.3.7] [Alexander G. McKay: Römische Häuser, Villen und Paläste, Feldmeilen 1984, ISBN 3761105851 p. 231] as these limits were often ignored despite the likelihood of taller insulae collapsing. [Gregory S. Aldrete (2004), "Daily Life in the Roman City: Rome, Pompeii and Ostia", pp. 78-9, ISBN 9780313331749]

The 16th century Yemeni city of Shibam is made up of over 500 tower houses, [http://whc.unesco.org/en/list/192 Old Walled City of Shibam] , UNESCO] each one rising 5 to 11 storeys high,citation|title=Land without shade|first=Hans|last=Helfritz|journal=Journal of the Royal Central Asian Society|volume=24|issue=2|date=April 1937|pages=201–16] with each floor having one or two apartments.citation|title=The Architecture of Mud: Construction and Repair Technology in the Hadhramaut Region ofYemen|last=Pamela Jerome, Giacomo Chiari|first=Caterina Borelli|journal=APT Bulletin|volume=30|issue=2-3|year=1999|pages=39–48 [44] |doi=10.2307/1504639] The city had the first high-rise mudbrick buildings, with some of them being over over convert|100|ft|m in height. These remain the tallest high-rise mudbrick buildings in the world.citation|title=The Hadhramaut|first=J. G. T.|last=Shipman|journal=Asian Affairs|volume=15|issue=2|date=June 1984|pages=154–62|doi=10.1080/03068378408730145] The tallest building in the city is the mudbrick minaret which stands at convert|175|ft|m tall.

Currently, the tallest high-rise apartment building and tower block in the world is the John Hancock Centre, constructed by Fazlur Khan in 1969. [http://www.emporis.com/en/wm/bu/?id=116876 John Hancock Center] , Emporis]


ee also

*Tower block
*Earthquake engineering
*Wind engineering

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