Abstract
The article analyzes the changes in the strength and deformation property of compressed steel tube-concrete elements when the quality indicators of the original concrete (strength class for axial compression) and the metal shell are changed. The methodology of testing for central compression of steel tube – concrete columns with a core of ordinary and super concrete with a thin-shell structure is described. Comparative dependences of the relative deformations in the axial and circumferential directions depending on the relative loading levels, destructive load values for samples from ordinary and super concrete are presented. According to the results of the research, it was determined that with an increase in the class of concrete, the efficiency ratio of the concrete is reduced by an average of 12%, however, the increase in bearing capacity remains quite noticeable. In addition, the use of high-strength concrete class C80 increases the deformability by about 10% compared with concrete class C40 steel-concrete columns, with significant savings in metal.
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