Elastoplastic sectional behavior of steel members under cyclic loading

The present paper is concerned with the cyclic elastoplastic sectional behavior of steel members subjected to the combined axial force and bending moment by employing the two-surface plasticity model in force space (2SM-FS), which takes accurately into account cyclic elastoplastic behavior of structural steels such as the yield plateau, Bauschinger effect and strain hardening. First the basic concepts of the 2SM-FS are addressed. Then the procedure for determining of the model parameters is presented and the values of the model parameters for circular, I and box sections are given. Finally the accuracy of the 2SM-FS is verified by comparing the cyclic elastoplastic sectional behavior of steel members obtained from the 2SM-FS with those of the direct integration method using the two-surface plasticity model in stress space (2SM-SS) and experiments.