This paper provides a newgeneral stress-strain lawfor concrete confined by steel, fiber reinforced polymer (FRP), or fiber reinforced\r\ncementitious matrix (FRCM), obtained by a suitablemodification of the well-known Sargin�s curve for steel confined concrete. The\r\nproposed law is able to reproduce stress-strain curve of any shape, having both hardening or softening behavior, by using a single\r\nclosed-form simple algebraic expression with constant coefficients. The coefficients are defined on the basis of the stress and the\r\ntangent modulus of the confined concrete in three characteristic points of the curve, thus being related to physical meaningful\r\nparameters. It will be shown that if the values of the parameters of the law are deduced fromexperimental tests, themodel is able to\r\naccurately reproduce the experimental curve. If they are evaluated on the basis of an analysis-oriented model, the proposed model\r\nprovides a handy equivalent design model.
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