Purpose. Determining the nature of deformation developing inside the concrete core and on the surface of steel casing at different loading stages using the strain measurement method. Studying features of strain-stress behavior of concrete-filled steel tube columns (CFST) of different cross-sections under axial compression; comparison of theoretical and experimental data of concrete-filled steel tube columns by their load-carrying capacity. Methodology. The method is based on detection of contact interaction between the concrete core performing under 3D stress and the casing of the steel concrete element at short-term static loading. Findings. Strength and load-carrying capacity of CFST elements are assessed. The obtained results allow beginning experimental studies on CFST constructions of various lengths and cross-sections using not only exterior, but also interior gauges in order to access the strain-stress behavior of constructions. Originality. New experimental data on the regularities of performance and destruction of CFST columns of various cross-sections were obtained. Practical value. The proposed methods for structural design enable both producing efficient composite structures that perform under compression and bending and designing loadcarrying elements for industrial facilities.

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