Roof arches without bending moments

E - Fixed Constructions – 04 – B

Patent

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Details

E04B 7/14 (2006.01)

Patent

CA 2610739

A dome type clear-span roof construction, having an exterior, polygonal arch frame (1), and a pre-tensioned, doubly curved membrane cover (2), which is suspended from the arch frame and is tied down to anchors (9) along its perimeter. Underneath the arch frame, a single, continuous suspension cable (4), anchored to the arch's end supports (8), is alternately taken through a series of upper pulleys (6) secured to the underside of the arch break points, and lower pulleys (5) secured at similar spacing to the membrane's ridge line (3), creating a multiple block-and-tackle suspension mechanism in the full length of the arch. The suspension mechanism converts the random membrane loads into concentrated, identical arch loads. The centerline of the polygonal arch coincides with the constant pressure line of its concentrated loads, which therefore do not cause bending moments in the arch.

La présente invention concerne une construction de toit de type dôme à travée ouverte, qui comprend un cadre polygonal extérieur en forme d~arche (1), et une couverture de membrane à double courbure précontrainte (2), qui est suspendue depuis le cadre en forme d~arche et qui est attachée à des brides d~ancrage (9) le long de son périmètre. Sous le cadre en forme d~arche, un seul câble de suspension continu (4), ancré aux supports d~extrémité de l~arche (8), est conduit de manière alternée à travers une série de poulies supérieures (6) fixées au côté inférieur des points de rupture de l~arche, et de poulies inférieures (5) fixées à intervalles réguliers sur la ligne de faîte de la membrane (3), créant ainsi un mécanisme de suspension à palan multiple dans toute la longueur de l~arche. Le mécanisme de suspension convertit les charges de membrane aléatoires en charges d~arche concentrées identiques. L~axe de l~arche polygonale coïncide avec la ligne de pression constante de ses charges concentrées, qui par conséquent ne produisent pas de moments fléchissant dans l~arche.

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