| In recent years,The SRC column-steel beam mixed frame structure have developed rapidly in China.It is made of type steel as a skeleton bar,the upper flange of a steel beam welding shear connections is reinforced,pouring concrete column and plate to form the whole component.The energy dissipation and bearing capacity of Composite Structure of steel reinforced concrete is superior to ordinary reinforced concrete structure.In earthquakes,buildings collapse is mainly due to the failure of the joints.The importance of joints to the whole seismic performance of composite structures is explained.In this paper,the seismic behavior of The SRC column-steel beam mixed joints and frame is studied by the finite element software ABAQUS.The main work is as follows.:(1)The finite element analysis of SRC column-steel beam middle joint and mixed joints considering the function of the floor under cyclic load at the end of beams is carried out by using ABAQUS,and the results are compared with results of the completed low-cycle load tests.The results show that the simulating results agree very well with the experimental date.The combined node finite element model used in this paper can be used for seismic performance analysis.(2)According to the verified mid-column joint model,considering of the effect of joint position,the finite element model of side column of the same frame is established,and the influence of floor slab on skeleton curve,stiffness degradation and stress distribution of the edge column joint is compared.(3)The parameter analysis of two kinds of SRC column-steel beam mixed joints(middle column,side column)is carried out,and the influence of the parameters such as section steel strength,concrete strength and steel beam height on the bearing capacity and rigidity of composite joints under cyclic load is discussed.(4)The modal analysis and dynamic elastic-plastic time history analysis of a two-span three-story SRC column-steel beam frame are carried out,and hybrid frame is builded considering of the function of the floor.According to the seismic code,three time-history curves of ground motion are selected to study the interstory displacement angles,base shear and stress distribution of type steel of the two frames under the same ground motion.The results show that the displacement angle of the two kinds of frames in the second floor are the biggest,which is the weak area of the structure.The hybrid frame adding reinforced concrete slabs which the overall anti-lateral displacement stiffness is increased,the interstory displacement is decreases and the plastic range area of steel is increased.The SRC column-steel beam mixed frame has better seismic behavior. |
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