the Popovics Stress-Strain Model Incorporating Confinement Effect

In recent years, the confinement effect in high strength concrete (HSC) has been studied by many researchers. Confinement effect results in increasing the strength and ductility of concretes columns considerably . To determine the amount of these increases and to simulate the behavior of these columns a compressive stress strain model containing the confinement effect is essential . In this paper , a number of well known stress strain models are evaluated against experimental data obtained by other researchers and their shortages are determined . Considering compressive strength, the modulus of elasticity , the strain corresponding to maximum stress and confinement stress are considered as main parameters , a new stress-strain model is developed such that it takes into account the effects of confinement . Comparing the results predicted by the proposed model with experimental results for a wide range of compressive strength from 20 to 120 MPa, show a good agreement.