Abstract
A comprehensive computational model to simulate the nonlinear seismic response of composite frames with rectangular concrete-filled steel tube (RCFT) beam-columns and steel girders and braces is presented in this work. A three-dimensional fiber-based distributed plasticity mixed finite element formulation is introduced. The finite element formulation of RCFT beam-columns was derived with separate translational degrees-of-freedoms (DOFs) defined for the concrete core and the steel tube to simulate the slip deformation that is typical for composite members. Cyclic constitutive relations were derived accounting for the interactions taking place between the steel tube and the concrete core including slip, confinement, and local buckling. A representative composite frame structure was analyzed under a suite of ground motion records and the demand imposed on the RCFT columns was quantified. A methodology based on the use of the damage function equations was proposed to evaluate the performance of RCFT members under seismic loads.
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