In order to reduce the labor needed in the construction of high with large section, a new construction method, which could reduce the section area of pier and the number of reinforcing bar, was developed. In the construction method, D 51 high strength reinforcing bar with yielding strength of 685 N/mm2 is used for longitudinal reinforcement, and high strength concrete with design strength of larger than 50 N/mm2 is adopted. In case of using high strength reinforcing bar forlongitudinal reinforcement, cut of reinforcing bar may occur before the crushing of concrete, if reinforcement ratio and material properties are not suitably adopted. In this study, the effects of material properties, such as yield ratio of reinforcing bar, the length of yield shelf and ultimate strain, and reinforcement ratio on the behavior of high pier were investigated through experiment and analysis. It was found that cut of reinforcing bar could be judged through section analysis. Throughthis study, the required properties of high strength reinforcing bar when being used for longitudinalreinforcement of high pier were clarified
