COMPRESSION CHARACTERISTICS OF EXPANSIVE CONCRETE FILLED STEEL PIPE WITH FLAT BAR IN CENTER

Abstract

We carried out the cyclic compression loading test of the expansive concrete filled steel tube with a flat bar in center to be used for the brace member of the energy dissipative braced frame to improve the mechanical characteristics of the tube as the brace member. The results of this experiment may be summarized as follows : 1) This tube has very high stiffness to compression load. 2) The bond strength betweeen the flat bar and the concrete is about 10MPa except for the both end parts of the tube. 3) The apparent initial stiffness of the concrete in the tube is about 43〜47GPa.