For the analysis of confinement effects by rectilinear ties the various analytical models available are examined. To select a model applicable to high strength concrete, the experimental results in the literature are compared with the analytical values predicted by various models. Based on satisfactory comparison, one model is then applied to the analysis of high strength concrete column subjected to biaxial bending. To examine the effectiveness of lateral confinement, four parameters i.e., concrete compressive strength, yield strength of hoop steel, hoop spacing, volume of hoop steel, are studied. Findings are as follows.
(1) Among the various confinement models studied in this, Yong's model shows the best agreement with experimental data for high strength concrete.
(2) In the biaxial bending action of column, confinement effectiveness is much larger in low strength concrete than in high strength concrete.
(3) High strength hoop steel is not effective in low strength concrete, but is helpful to enhance the load resisting capacity an ductility in high strength concrete.
(4) The more the volume of hoop steel is the higher the load resisting capacity and ductility.
