Non-linear Finite Element Analysis On Seismic Behavior Of Concrete-Filled Steel Tubular Frames

The concrete-filled steel tubular structures is superior to other structures in technology and economy because of its advantages, therefore the domestic and international scholars have carried on many researches on mechanics performance and design methods of the concrete-filled steel tubular structures. Nowadays, many works have been done about the seismic behavior of CFST members in many countries by theoretical studies and pseudo dynamic testing and quasi-static testing. However, the research on the working performance of CFST frame has seldom been investigated, especially shaking table testing and response of structure und actual earthquake wave. The time-history seismic analysis can truly reflect the seismic behavior of structure and find out the earthquake response when earthquake happens, so it is the precise method at present. In this paper, author carries on three-dimensional finite element analysis to the seismic behavior of concrete-filled steel tubular frames under actual earthquake waves by LS-DYNA software. The questions such as acceleration, displacement, hysteretic behavior, ductility and the ability of energy dissipation have been emphatically studied about a one-lay-two-story CFST and reinforced concrete frames. Finally, the force-displacement relationship of CFST is researched, and effect of various factors to this skeleton curve is discussed. The theoretical analysis demonstrates that the CFST frames have good response to earthquake loading even in case of high earthquake intensity. The work in this paper laid a good basement for future profound research on the seismic of CFST structures and must do help to its practice use.