Analytical model for concrete confined by steel stirrups and/or FRP jackets in rectangular sections
This paper illustrates the extension to the rectangular section of an analytical model for confined concrete proposed for square sections confined by steel stirrups and/or FRP jackets. The confined concrete model is developed starting from the elasticity theory and under the key assumption that the confinement acts under the plane-strain conditions. The confining pressure within the section core is obtained by an analogy formulated in polar coordinates regarding internal co-axial cylinders for obtaining the equivalent confining pressure within the section core.