EXPERIMENTAL STUDY OF THE SIZE EFFECT ON THE BEHAVIOR OF CONCRETE FILLED CIRCULAR STEEL TUBE COLUMNS UNDER AXIAL COMPRESSION

Abstract

The purpose of this research is to clarify the size effect on the uni-axial compressive behavior of circular concrete-filled steel tube (CFT) short columns. Three different sizes of CFT short column specimens were tested. Other experimental , parameters were the strength of filled concrete and loading methods (applying the compression load only on the filled-concrete and on the overall cross-section). This paper first presents the test results concerning compressive strength and discusses the evaluation of the strength of circular CFT short columns considering the size and confined effects.