Abstract
The paper presents research results of push – out tests of compressed tubular composite elements with a circular and square hollow section filled with SCC concrete. Bond between steel and self-compacting concrete in tubes tested after 28 days and after 3 years was investigated in this study. The analysis shows that bond between steel and SCC concrete in CFST elements depends on the cross-section geometry, the thickness of the steel profile wall, the concrete age, and also on the compressive strength of concrete. One of the main conclusions of this research is that concrete shrinkage has a significant influence on bond between steel and self-compacting concrete. The resistance to the vertical shear in the interface between steel and concrete is twice time lower in tubes tested after 3 years. The maximum axial force increase with the increase of compressive strength of SCC. The research results of elements tested after 28 days and after 3 years were compared with recommendations given in the EN 1994-1-1 Eurocode 4 [26]. This standard can be used only for composite elements made of lightweight and vibrated concrete. The conclusions from the analysis of the test results suggest that the requirements given in the design code – Eurocode 4 are not sufficient for SCC concrete.
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