Estimation Method of Load-Carrying Capacity of Heavily Confined RC Column Considering Core Concrete Strength under Triaxial Compression

The authors have already clarified that the upper-bound load-carrying capacity of RC column considering the buckling of the primary rebar without the lateral confinement is rational both theoretically and experimentally in the basical design concept, and the trinity among the load-carrying capacity, the pitch spacing and the design yield strength of primary rebar has been developed for the first time. This paper deals with the main, important items as follows: ① The effect of the lateral pressure of core concrete of the RC column on the buckling 1oad of primary rebar. ② The analysis of the load-carrying capacity of only hollow reinforcement cage. ③ Formularizing the load-carrying capacity of confined column considering the buckling of primary rebar and the triaxial strength of core concrete.