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Bent (structural) : ウィキペディア英語版
Bent (structural)

A bent in American English is a framework composed of several structural members that defines the cross-section of a timber frame building or supports a trestle. In British English this assembly is called a "cross frame". The term ''bent'' is probably an archaic past tense of the verb ''to bind'', referring to the way the timbers of a bent are joined together. The Dutch word is ''bint'' (past participle ''gebint''),〔Woordenboek van de Limburgse dialecten II-9, Volume 2; Volume 9 By Antonius A Weijnen Joep Kruijse〕 the Frisian is ''bynt'', and the German is ''bind''. Compare this with the term bend for a class of knots.
Bents are the building blocks that define the overall shape and character of a structure. They do not have any sort of pre-defined configuration in the way that a Pratt truss does. Rather, bents are simply cross-sectional templates of structural members, i.e., rafters, joists, posts, pilings, etc., that repeat on parallel planes along the length of the structure. The term bent is not restricted to any particular material. Bents may be formed of wooden piles, timber framing,〔Charles Lee Crandall and Fred Asa Barnes, (Railroad Construction ), McGraw Hill, New York, 1913; Section 97, Principles of Construction, pages 213-215.〕 steel framing, or even concrete.〔W. S. Lacher, The Track Elevation Subways in Chicago, (Railway Age Gazette ), Vol 56, No, 10 (March 6, 1914); page 461.〕
==Construction==
Bents are generally pre-assembled, either at the timber framing company's shop or at the construction site. After the basic post and beam structure of the frame has been set in place, the bents are then lifted and simply dropped into place one by one by the crane. Next, the workers bring in additional members, purlins, which tie them together and give the frame a more rigid structure. This process is very safe and efficient, as it allows a crew to assemble a large portion of the frame without ever stepping off the ground. This, in turn, minimizes the amount of time that the crew must spend several stories in the air clambering along beams not much wider than their own feet.

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