The gathered experience of design and construction of objects with the use of grid structures confirms the expediency, efficiency and flexibility of their minimum technical solutions providing increased strength and resistance to progressive collapse. From the general range of modern metal designs using shaped tubes (bent and welded profiles) the article observes blocks of roofs and ceilings made of cross-type farms «Pyatigorsk» as the most step-ahead solutions. Due to the small size they are conventionally classified as «pocket» modules produced all-welded. Prospects of the use of shaped tubes of round and oval cross-sections for further modernization of farms and other cross-lattice structures are presented. The article demonstrates quite acceptable accuracy and ease of optimization calculation of oval cross sections according to an approximation method. The authors describe a new technical solution for lattice structures, which contributes to the improvement of their technical and economic characteristics. Reduction in the consumption of structural material when implementing such a solution is discovered by the example of roof trusses, as well as increase of the reliability and structural safety of buildings and structures by approximation of lattice structures to their design schemes (models) in the form hinged-rod systems.
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