Abstract
A series of compression loading tests was conducted to develop a confined model for high strength concrete cylinders. It is found that the confinement effect on the peak strength, strain at the peak strength and stiffness of the deteriorating branch decreases as the concrete strength increases. An empirical formulation for the peak strength, the strain at the peak strength and the stiffness of the falling branch was developed depending on the concrete strength. Also, a stress-strain model that represents an entire range of stress-strain relationship was developed. The proposed stress-strain model provides an accurate estimation for concrete with the strength from 30MPa to 90MPa and the volumetric hoop reinforcement ratio from 0.45% to 1.36%.
