A
saddle roof is a roof form which follows a convex curve about one axis and a concave curve about the other. The hyperbolic paraboloid form has been used for roofs at various times since it is easily constructed from straight sections of lumber, steel, or other conventional materials.
[ A Dictionary of Architecture, Fleming, Honour, Pevsner] The term is used because the form resembles the shape of a
saddle.
Sometimes referred to as a hypar, the saddle roof may also be formed as a tensegrity structure.[ Membrane Structures: Understanding Their Forms, Prof. Dr. Eng. M. Mollaert]
Mathematically, a saddle shape contains at least one saddle point.
The historical meaning is a synonym for a gable roof particularly a dual-pitched roof on a tower, also called a pack-saddle roof.[Passmore, Augustine C.. "Saddle Roof". Handbook of technical terms used in architecture and building and their allied trades and subjects,. London: Scott, Greenwood, and Co.;, 1904. 303. Print.]
Gallery
Image:Church Army chapel 042.jpg|A hyperbolic paraboloid saddle roof: Church Army Chapel, Blackheath
Image:Pengrowth_Saddledome.jpg|A hyperbolic paraboloid saddle roof: The Scotiabank Saddledome in Calgary, 1983
Image:Dorton Arena West Side.JPG|Dorton Arena designed by Maciej Nowicki, Raleigh, North Carolina, United States, 1952
Image:London Velopark, 16 April 2012.jpg|A hyperbolic paraboloid saddle roof: the London Velopark
Image:Gothia Towers, Mässan och Scandinavium 02.JPG|A hyperbolic paraboloid saddle roof: Scandinavium
Image:W-wa Ochota PKP-WKD.jpg|A Paraboloid roof of Warszawa Ochota railway station in Warsaw, Poland, 1962
Image:Wrexham Waterworld Leisure and Activity Centre.JPG|Wrexham Swimming Baths, now Wrexham Waterworld Leisure and Activity Centre, feature a hyperbolic paraboloid roof in Wrexham, Wales, United Kingdom, 1969
File:Canada Place - Vancouver 052.jpg|Multi-semi-hyperbolic-paraboloid roofs on Canada Place, Vancouver, Canada
See also
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Sagrada Família
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eight hyperbolic parabolas rise to form the roof of Cathedral of Saint Mary of the Assumption and St. Mary's Cathedral, Tokyo.
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Hyperboloid structure
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List of hyperboloid structures
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Metro San Lázaro
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Xavier University
External links
