ULTIMATE STRENGTH AND PLASTIC DEFORMATION CAPACITY OF CFT COLUMNS WITH COVERING RC CONSIDERING MATERIAL COMBINATION

Abstract

Concrete filled steel tubular columns are frequently used for high-rise residential buildings in Japan. In this paper, the ultimate strengths and plastic deformation capacities of these columns with covering concrete were experimentally investigated for various combinations of materials, such as ordinary strength and high strength concrete. As the results, it is verified that the ultimate strengths of these columns can be evaluated with the generalized superposed strength theorem, and their plastic deformation capacities are satisfactory against severe earthquakes.