CHEMICAL PRESTRESS AND TENSION CHARACTERISTICS OF EXPANSIVE CONCRETE FILLED STEEL PIPE WITH FLAT BAR IN CENTER

Abstract

We carried out the experiment of the brace members made of the expansive concrete filled steel pipe with a flat bar in center. The results of this experiment may be summarized as follows: 1) the share ratio between the flat bar and the steel pipe of tensile force due to chemical prestress is almost constant and independent on a variation in the cross section of the flat bar, 2) The apparent tensile strength of the concrete in the brace is mostly dependent on chemical prestress, 3) The real bond strength betweeen the flat bar and the concrete is about 75〜100kgf/cm2.