Study On Seismic Performance Of Concrete-filled Steel Tubular Frame Structure

Concrete-filled steel tubular is the combination of steel tubular and concrete, it gives full play to the tensile strength of steel and compressive strength of concrete. With the advantages of high bearing capacity, good ductility, fire resistance ability, concrete filled steel tubular is widely used in modern buildings. Currently, most research is done on the massive structure of concrete filled steel tubular, solid and hollow concrete filled steel tubular column in a construction at the same time is rarely studied.Based on two kinds of concrete-filled steel tubular frame structure seismic performance analysis, SAP2000 was used in this paper to replace the upper column with steel pipe column, middle layer column with hollow-steel tube concrete column, and six hollow concrete-filled steel tubular frame structures were established with different hollow ratio and different distribution ratio in columns to compare the earthquake resistant behavior of solid and hollow concrete-filled steel tubular frames. The hollow concrete-filled steel tubular columns in the model is formed by subducting partial concrete in the solid concrete-filled steel tubular columns, the hollow steel tube column is formed by subducting total concrete in the solid concrete-filled steel tubular columnsFirstly, dynamic characteristics of the models were observed, then the vibration mode decomposition response spectrum method is analyzed under frequent earthquake. The displacement and internal force response were researched with the effect of variation of holes rate and distribution ratio of columns. At the same time, Displacement and interlaminar shear force under response spectrum analysis between the layers of solid and hollow concrete-filled steel tubular frames were compared. Then dynamic and time-historical analysis under frequent and rare earthquake. Apical displacement, acceleration of vertex, story drift and interlaminar shear of solid and hollow concrete-filled steel tubular frames were compared. Several proposal were provided to concrete-filled steel tube structure by the study of earthquake resistant behavior of solid and hollow concrete-filled steel tubular frames.