A B S T R A C T R 15 S U M I~By statistically processing a great number of experimental data (about 130) from the literature, we have pointed out that the main relations proposed by various authors to express the increase in strength and strain of concrete at the peak due to confinement agree with the physical reality only if parameters involved over a limited range are included.This has led us to propose a relation which is capable of estimating the increase in strength and strain of concrete due to confinement and which is valid up to very high strengths, for a wide range of confinement and for any specimen shape.
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