Nonlinear analysis of mixed steel-concrete frames. II: Implementation and verification

This is the second of two companion papers that describe the formulation of analysis models for simulating the inelastic seismic response of three-dim ensional mixed frame structures comprised of steel, reinforced-concrete, an d/or composite members. Described in a companion paper is the flexibility-b ased formulation of a three-dimensional beam-column element to model the in elastic cyclic behavior of beam-columns under combined axial load and biaxi al bending. This paper describes the development of yield surface equations and stiffness parameter calibration for bisymmetric steel, reinforced conc rete, and encased composite beam-columns. Accuracy of the model is verified through comparisons to data from previously published tests and detailed a nalyses.