Elastic-plastic Analysis Of The Concrete-filled Steel Tubular Composite Column Frame Structure System

As a new member of the structural systems,gradually,the concrete-filled steel tubular composite column has got attention in recent years.However,there are few studies on the elastic-plastic analysis of concrete-filled steel tubular composite column at home and abroad,and the related research results are few.Therefore,this paper focuses on the elastic-plastic analysis of concrete-filled steel tubular composite column,and analysis of progressive collapse.In this paper,we use the PERFORM-3D which is a finite element structure analysis software to research the characteristics of seismic response in the models of composite column frame system,the composite column-the eccentrically braced system and the composite column-the buckling-restrained steel plate shear walls system.By using mode-superposition response spectrum method,it analyze the inter-story displacement angle and story shear force.And use the Pushover method to get the inter-story displacement angle and nonlinear deformation of the material corresponding to the performance point,and to evaluate its seismic performance.Then the dynamic elastic-plastic analysis of the structure is carried out by using El-Centro wave,lanzhou wave and Taft wave.And obtain layer displacement,inter-story displacement angle,story shear force and top displacement through the research.The results show that the structure is from the composite column frame system to the composite column-the eccentrically braced system to the composite column-the buckling-restrained steel plate shear walls system,with the increase of stiffness,the layer displacement and inter-story displacement angle are decreased,but the base shear is increased.Parts of steel beam are yield,but all the composite column are not yield.As can be seen from the energy consumption diagram,the energy dissipation of the beam is greater than that of the column,and the structure meets the requirements of the " strong column weak beam".According to the research of progressive collapse in the models of composite column frame system,the composite column-the eccentrically braced system and the composite column-the buckling-restrained steel plate shear walls system,it shows that only one column is breaked in any of the composite column,progressive collapse of frame system will not happen,if a composite column is broken,the frame system will collapse,because the plastic rotation of the beam is greater than the specification value.After the eccentrically bracing and the buckling-restrained steel plate shear walls,the plastic rotation of the beam is less than the standard value,and it will not collapse.