Research On Seismic Behavior Of Steel Beam-Square Concrete Filled Steel Tube Column Frame

In China, the development of concrete filled square steel tubular structures is rapid in recent years. The system of concrete filled rectangular steel tubular (CFST) column, with steel H beams, is a new type composite structure, which can offer some constructional merits. Now, it has been paid more attention in the areas of engineering application and theoretical research. It can be used in pactice engineering, especially in the application in buildings, from high-rise building to middle height building.Researchers have conducted a lot of research on the hysteretic performance on CFST beam-columns under reversed cyclic load, but the research on CFST column system's dynamic performance is still relatively scarce. In order to study the seismic behavior of CFST, elasto-plastic time history analysis using Perform-3D software(Nonlinear Analysis and Performance Assessment for 3D Structure) has been carried out, based on a pseudodynamic test of a 4/7-scaled model of a three-span, ten-storey concrete-filled rectangular steel tubular frame. The model was first subjected to seismic loadings of increasing magnitude based on the El Centro ground motion, and then the Kobe waves. The values predicted by the calculation model were compared with the measured data. Then, pushover analysis using Perform-3D software and Sap2000 software has been carried out. The results show that the CFST structure excels in seismic behavior.The author also compares the cost of the CFST frame and conventional steel frame for an apartment building. From the comparison, it can be conducted that the CFST-H steel frame system has similar capacity as conventional steel frame, however is more economical than steel frame.