Abstract:In order to study the seismic behavior of concrete-filled steel tubular column-steel beam staggered joints, based on the existing experimental research results, the OpenSees finite element software is used to numerically simulate the concrete-filled steel tubular column-steel beam staggered joints, and the simulation results are compared with the experimental results. The two are more consistent. Through numerical simulation, the effects of axial compression ratio, concrete strength grade and steel strength on the seismic behavior of concrete-filled steel tubular column-steel beam staggered joints are analyzed. The results show that the bearing capacity decreases with the increase of axial compression ratio in the range of 0.3~0.7. With the increase of concrete strength grade, the ultimate bearing capacity of specimens increases obviously, and the maximum increase is 9.39%. Through comparison, it is found that reasonable increase of strength steel can effectively increase the structural bearing capacity and ductility. When the Q345 steel is simulated, the ultimate bearing capacity of the test piece increases by 26.08%, and the displacement point of the damage point increases by 8.41%.