Pushover analysis of seismic behavior of steel-concrete composite beam and concrete-filled rectangular tube frame structure

Based on the sectional constitutive model under consideration of different positive and negative stiffness and strength due to the composite section,a finite element model of the composite beam for the dynamic elastic-plastic analysis is developed in this paper.A pushover analysis is performed for a 15-story composite beam and concrete-filled rectangular tube frame structure,which provides a reference for the seismic analysis of composite frame structures and the application of the pushover method to this system.And then the dynamic characteristics of this system are compared with those of frame structures which are composed of concrete-filled rectangular tubular columns,RC columns and steel beams.It can be concluded that the composite beam and concrete-filled rectangular tube frame structure is more advantageous in the aseismic performance.