An Influence of Roof Lattice Girder Inclination on the Work of Structural Systems Supporting Shed Roof Sheeting

The article presents the results of the research related to an influence of changes in the shape of flat tubular frames, constituting structural systems of sheds, on their strength work and stability. The shape changes are made as a result of inclining the roof lattice girders of these frames to a horizontal plane. An initial rectangular frame system, called the basic frame configuration, is optimized first. The optimal base configuration is then converted to a few derivative rectangular trapezoid configurations. The purpose of creating diversified frame configurations is that they can be arranged along the length of a building to obtain subsequent diversified transverse supports for spatial shell roofs. Each examined configuration consists of two vertical columns and a horizontal or oblique lattice girder loaded uniformly with the successive folds of the roof sheeting along the length of its top chord. Each sheeting is composed of thin thin-walled folded sheets connected to each other with their longitudinal edges. The area of the knowledge under consideration is one of several uniform and coherent research areas analysed so far. The previously considered area has been related to the influence of frame column inclination on the stability and strength performance of flat frame systems. The results of the conducted analysis are to be the basis for the development of a uniform comprehensive method for parametric shaping of unconventional building forms covered with metal folded sheeting supported by effective flat frame structural systems characterized by diversified shapes and arranged along the length of the designed building sheds.