Calculation of plane frames of inelastic constituents

Calculation of the plane frame systems’ deformation is considered. Under non-linear load, translational and angular misalignment of the frames is obtained. Elements of the frames are inelastic component rods with variable cross sections and variable stiffness along the length of their shear ties. The solution is based on A. R. Rzhanitsina’s theory of elastic composite bars. Statically indeterminate frame is disclosed by the method of deformation. Stiffness of constituent elements is determined by the expression determining the equivalent of deformation coefficient, which was previously obtained by the author. The expression takes into account compressibility of the branches, shear deformation of the branches’ material, development of inelastic deformation in them.