Abstract
Compression-bending tests and compression-bending-shear tests of R/C columns were carried out. Compression was constant and bending/bending-shear was monotonic. The bending moment in compression-bending-shear test was antisymmetric along the column axis. The compressive strength of the concrete ranged from about 300kg/cm^2 to about 600kg/cm^2. The compressive behavior of the concrete around the critical section of R/C column was evaluated by using the compressive stress value k・σ_B of equivalent stress block. The following conclusions were obtained. 1) The value of kmax under compression-bending-shear is larger than that under compression-bending. 2) The value of kmax under compression-bending-shear is affected by the history of compression-bending combination. 3) The value of kmax is little affected by compressive strength of concrete σ_B. 4) The value of k under compression-bending-shear is stable.
