From Wikipedia, the free encyclopedia
A segmental arch.

A segmental arch is a type of arch with a circular arc of less than 180 degrees. [1] It is sometimes also called a scheme arch. [2]

The segmental arch is one of the strongest arches because it is able to resist thrust. [3][ clarification needed] To prevent failure, a segmental arch must have a rise that is equal to at least one-eighth the width of the span. Segmental arches with a rise that is less than one-eighth of the span width must have a permanent support or frame beneath the arch to prevent failure. [3]

The segmental arch is very old (the versions were cut in the rock in Ancient Egypt c. 2100 BC at Beni Hasan). Since then it was occasionally used in Greek temples, [4] utilized in Roman residential construction, [5] Islamic architecture, and got popular as window pediments during the Renaissance. [4] The closed- spandrel Pont-Saint-Martin bridge in the Aosta Valley in Italy dates to 25 BC. [6] The first open-spandrel segmental arch bridge is the Anji Bridge over the Xiao River in Hebei Province in China, which was built in 610 AD. [7]

Segmental arches are most commonly used in the 20th century in residential construction over doorways, fireplaces, and windows. [3]

References

  1. ^ Harris, Cyril M. (1983). Illustrated Dictionary of Historic Architecture. New York: Dover Publications. p.  485. ISBN  9780486244440.
  2. ^ Smith, Percy Major (2015). Rivington's Building Construction. Abingdon, Oxfordshire, U.K.: Routledge. p. 6. ISBN  9781317742432.
  3. ^ a b c Kreh, Richard T. (2015). Masonry Skills. Stamford, Conn.: Cengage Learning. p. 401. ISBN  9781285426839.
  4. ^ a b Woodman & Bloom 2003, Segmental.
  5. ^ DeLaine 1990, p. 417.
  6. ^ O'Connor, Colin (1993). Roman Bridges. Cambridge, U.K.: Cambridge University Press. p. 171. ISBN  9780521393263.
  7. ^ Temple, Robert K.G. (1986). China: Land of Discovery. Wellingborough, Northamptonshire, U.K.: Stephens. pp. 69–71. ISBN  9780850598582.

Sources