Analytical stress-strain model for high-strength concrete members under cyclic loading

A new proposal for describing the hysteretic stress-strain behavior of high-strength concrete (HSC) under reversed cyclic loading is presented. The envelope curve is derived from the results of uniaxial, monotonic, compression loading tests of 108 large-scale specimens. It explicitly accounts for the effects of concrete compressive strength, volumetric ratio of transverse reinforcement, yield strength of ties, tie spacing, and tie pattern. The proposed model is implemented in the finite element program ADAPTIC, with a view to analyzing HSC members under reversed cyclic loading. This analysis accounts for energy dissipation through hysteretic behavior, stiffness degradation as damage progresses, and degree of confinement. Comparisons with test results showed that the proposed model provides a good fit to a wide range of experimentally established hysteresis loops. This model also keeps the computing costs of nonlinear analysis within acceptable limits.