A circular cross-section tube-concrete columns (CFSTC) samples study under local compression with initial eccentricity was carried out. Interlocking steel elements were placed in the concrete core in order to increase the strength of eccentrically compressed pipe-concrete columns. They were laid in three rows in the space between the freshly laid concrete upper end and the steel pipe inner surface. Moreover, the interlocking elements lower and upper layers were made in the form of partially truncated tetrahedrons, obtained by cutting the cubes with planes passing through their middle edges into two equal parts. A cubes layer was placed between the truncated tetrahedrons layers so that all the elements were in close contact with each other with their faces. The performed experiments confirmed the interlocking structures ability, due to their high rigidity, to more evenly redistribute concentrated loads transmitted through them. It is shown that the rational geometry selection of the structural interlocking elements and the conditions for their interaction with each other can be an effective method for increasing the structures certain sections rigidity. The 3 layers interlocking elements structure use noticeably changed the pipe concrete columns samples deformation and destruction nature, which led to an increase in the studied samples strength by an average of 11%.