Structural Mechanics of Engineering Constructions and BuildingsStructural Mechanics of Engineering Constructions and Buildings1815-52352587-8700Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)10932Research ArticleAN ACCOUNT OF RIBS, THAT DON'T COINCIDE WITH LINES OF PRINCIPAL CURVATURES, IN A SHELL ANALYSIS BY VARIATIONAL-DIFFERENCE METHODKushnarenkoI Vivan.v.kush@yandex.ruPeoples' Friendship University of Russia, Moscow150120151505812092016Copyright © 2016, Structural Mechanics of Engineering Constructions and Buildings2016It is considered stiffeners, that don't coincide withlinesof principal curvatures,in thevariational-difference method(BPM) analysis of shellsof complex shapedefinedin the linesof the principal curvatures.Ribs aredescribed by theKirchhoff-Clebsch theory of curved bars:a tension, a bendinganda torsion ofa rib are taken into account; shells are described by the Kirchhoff-Love theoryof thin elasticshells.reinforcementsribsribbed shellsribs not in lines of curvatureform- findingnumerical methodsvariational-difference methodtotal potential energyподкрепленияребристые оболочкирёбра не в линиях кривизнформообразованиечисленные методывариационно-разностный методсеточный методполная энергия деформации