Seismic Behavior Of Fabricated Connections Between Concrete-Filled Square Tubular Column And Steel Beam

The concrete-filled steel tubular structure has the advantages of high bearing capacity, good plasticity, convenient construction and fine fireproof performance. Nowadays, with the development of building industrialization, our country has carried out a series of building projects. The application of concrete-filled steel tubular structure is becoming more and more popular. However, the seismic behavior of connections plays an important role in the seismic behavior of concrete-filled steel tubular structure. In this paper, further research was made on the diaphragm-through connection between concrete-filled steel tubular column and steel beam.The commonly used forms of connections between concrete-filled steel tubular column and steel beam were introduced and a brief introduction to the research on these connections was given.Considering on the particularity of the diaphragm-through connection, this paper focused on the study of width-to-thickness ratio of the tube and thickness of the core zone. In order to study the influence on the seismic behavior of such connections, four specimens were tested under low-reversed cyclic loading. The failure process and feature of each specimen were sumarized. In addition, seismic behavior of such connections was analyzed, including bearing capacity, ductility, energy dissipation and so on. The results of the experiment showed that bearing capacity and energy dissipation were improved with the increase of the thickness of steel tube.And shear deformation reduced with the increase of the thickness of the core zone.ANSYS was applied to study the seismic behavior of such connections. The results of the experiment agreed well with the results of finite element analyses. Based on the finite element analyses, the influence of the concrete, compression ratio and extending length on bearing capacity was studied.