In this research paper, engineering properties of structural elements formed of combined metalic sections are compared with the suggested structural element made of steel pipes full of concrete. Such a comparison is carried out for bending and torsion carrying capacities of above mentioned elements with the same height and crosssection. Structural characteristics and material properties of steel pipes full of concrete are presented. The Study of stress state created in concrete pipes using the general principles of structures mechanics is presented. A special relation to determine the carrying capacity of the concrete pipe under various levels of axial compression is suggested. Theoretical results got on the basis of Euler equation are compared with experimental results of special specimen tested in laboratory. A good agreement between theoretical and experimental results is demonstrated.