Comparative analysis of different approaches to designing thin-walled element structures of composite materials

The paper deals with three approaches to designing thin-walled element structures of composite materials on the basis of quaisiisotropy, equistrength and optimality criteria. A comparative analysis of the results of designing on the basis of these criteria has been performed which made it possible to determine areas of their application. Problems of designing with regard to torsion rigidity demands are also dealt with.