Concrete strengthening coefficient dependence on geometric parameters of steel tubular concrete-filled elements

Abstract

Due to artificially created conditions of strain restriction of concrete by an external tube-shell the phenomenon of strengthening occurs in steel tubular concrete-filled elements. To take into account the strengthening of concrete in terms of its volumetric stress-strain state, a large number of methods for calculating the strength of compressed tubular concrete-filled elements were developed. But their empirical basis does not contribute to a deep understanding of the complex work of composites of tubular concrete-filled elements.