Seismic Behavior Analysis Of Steel Reinforced Concrete Filled Steel Tubular Composite Columns And Frames

The Steel reinforced concrete filled steel tubular column(SRC)is a kind of concrete filled with steel reinforced concrete(SRC),which is filled with concrete filled steel tubular columns.Then the Vierendeel steel reinforced concrete and concrete-filled steel tubular columns are combined together to bear the load.This composite column has high bearing capacity,good seismic performance advantages,and can reduce the section size of the column,increase the use of the building space and other advantages,greatly overcomes the shortcoming of the reinforced concrete structure and has been widely used in engineering.In this paper,two kinds of finite element software ABAQUS and MIDAS/Gen are used to analyze the mechanical behavior of steel reinforced concrete column and frame system.Through the research and analysis,it provides a theoretical basis for practical projects.The main research of this thesis are as follows:In order to study the bearing capacity and mechanical behavior of SRC columns,12 steel reinforced concrete filled steel tubular composite columns are modeled by using ABAQUS finite element software.After the establishment of model,select and determine the constitutive relation of concrete and steel,boundary conditions,loading and mesh,by changing different parameters,for example,steel ratio,column height,strength of concrete and eccentricity,then analyzing bearing capacity and mechanical performance of the steel reinforced concrete filled steel tubular column.And compared with the test results.The results show that with the increase of steel ratio of steel,the bearing capacity of eccentric compression member model is enhanced,stiffness is improved;with the increase of height,the bearing capacity of eccentric compression member model is reduced,the stiffness decreased;with the increase of eccentricity,the capacity test of eccentric compression model is reduced,the stiffness is decreased;with the increase of concrete strength grade,the bearing capacity of eccentric compression member model is enhanced,stiffness is improved.In order to study the static and dynamic elastic-plastic behavior of steel reinforced concrete filled steel tubular composite column frame system.In this paper,using the large finite element software MIDAS/Gen builds structure of steel reinforced concrete filled steel tubular column frame structure and analyzed by pushover,and using the method of stiffness generation,the steel reinforced concrete filled steel tubular column frame structure structure translate into reinforced concrete structure,so MIDAS/Gen is able to analyze.In this paper,building 9 storey frame model by the actual size and analyzing the structure cycle and structure formation,lateral displacement and the X and Y direction of the performance point,interlayer displacement angle,layer displacement and shear as well as the X and Y direction of the hinge.under rareearthquake,the structure have good seismic performance and energy dissipation ability.Then analyzing the nonlinear dynamic elastoplastic of the structure model by using MIDAS/Gen software,through selecting of El-Centro wave,Taft wave and artificial wave,extracting the top displacement time history curves and shear time history curves of three different seismic waves,resulting the top displacement and maximum bottom shear.Then analysis of interlayer displacement angle under three seismic waves,The results show that the structural model can meet the requirements of the seismic performance of the "big earthquake not falling" under the strong earthquake.