Study On Seismic Behavior Of The Tube In Tube Structure With CFST Outer Tube And SCS Inner Tube

With the development of social economy,more and more high-rise structure raises people's concern.With the increase of floor,people require more on the living comfort,so the domestic building structure becomes more complex.In recent years,our country have decided to develop the prefabricated steel buildings.Assembly of steel structure has the advantages of low energy consumption,short construction period and less construction waste.In this paper,Study on seismic behavior of the tube in tube structure with CFST(concrete filled steel tube)outer tube and SCS(the double plate steel-concrete composite shear wall)inner tube.The tube in tube structure is commonly used in high-rise building structure.The SCS used in the structure is a new type of assembly that conforms to the construction of the steel structure.Two models were established by ETABS,one is the30-layer inner tube for the combination of shear wall tube in tube structure,the second is based on the anti-lateral stiffness method to convert the inner cylinder into a reinforced concrete shear wall tube in tube structure;The third is with the SCS and other cross-section of the reinforced concrete shear wall cylinder tube structure,and then the seismic performance analysis of the models were compared.The main works are as follow:1)This paper introduces the development of concrete-filled steel tubular and double steel-concrete composite shear wall.2)The characteristics of tube in tube structure is introduced.3)The main seismic design method and finite element software are introduced.The structures were analyzed by static analysis and dynamic analysis.4)According to the results of modal and response spectrum analysis,the self-vibration period,the maximum displacement between layers,the maximum displacement angle and the shear force of the two models are compared with the requirements of the specification.The data show that the two models are basically identical and have sufficient correctness.5)The elastic time history analysis and the elastic-plastic analysis under rare earthquakes.Through the analysis of the results,combined with regulatory requirements,Compare the two models to verify the correctness of the model again and reflects the structure of good seismic performance.6)The inner tube structure of the reinforced concrete shear wall with the cross section of the tube structure of the SCS was analyzed and compared.