Brittle failure of square high-strength columns has been one of the major problems with the performance of reinforced concrete structures under gravity loads. A new method to prevent reinforced concrete columns from brittle failure. The method is called transversely reinforcing method in which only the critical regions are confined in steel tube. The steel tubes can change the failure mode of the latter columns from the shear to the flexure. The steel tubes also increase the compressive strength, shear strength and deformation capacity of the infilled concrete. This paper is to study the structural behavior of high-strength R/C short columns confined in rectangular steel tube subjected to uniaxial compression. The main objectives of the experimental investigation are to determine strength considering the effects of (1) configuration of tie details (2) volumetric ratio of lateral steel to concrete core. To achieve the above objectives, four specimens were tested. As a result, steel tube confinement which confined the infilled concrete were behaved effectively after inelastic zone. The amount of lateral steel appeared to have an effect on behavior of the confined concrete.