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Geometryczne kształtowanie segmentowych przekryć powłokowych z płaskich arkuszy blachy trapezowej

Abramczyk J.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

2011

z. 58, nr 1

19-30

The paper presents a way of geometrical shaping of the building structural covers consisting of many rectilinear shells made of flat profiled steel sheets free deformed to the shell shape during assembly work. The way consists in creating two families of planes separating the neighboring sectors Sigmai_lj and Sigmaij (of the ruled surfaces Betai_lj and Betaij) of the space geometrical structure Fir modeling the building structural cover. The ruling tij of he ruled surface containing the border lines of the sectors Sigmaij are calculated in these planes. Each pair of the sectors Sigmai_Ij and Sigmaij of the continuous structure Fir has got the common segment of the border lines being the space quadrangles whereas each pair of the neighboring sectors Sigmai_lj and Sigmaij of the discontinuous structure Fir has got the suitable segments of the border lines contained in the same plane. The way assures the freedom of transversal strains of the free deformed sheets during assembly, hence the sheets are subject to free deformations. The above activity makes it possible to obtain the small intentional effort and reserve the conveyance capacity of the useful load for the successive shell folds although the shell form can be almost free and attractive.