Study On The Mechanical Properties Of End-plate Joints Between Square Steel Tubular Column Filled With Steel-reinforced Concrete And Steel Beams

With the fast development of technology and economy, people use the the concrete filled-steel tube(CFT) structure more and more commonly. Mealwhile, the advantage of the CFT structure has being recognized by the engineering staff. However, there is little reaserch to the square steel tubular filled with steel-reinforced concrete structure, and especially, the square steel tubular filled with steel-reinforced concrete column-beam nodes is the key problem to the study of the concrete-filled rectangular tubular (CFRT). So, the study of the square steel tubular filled with steel-reinforced concrete column-beam nodes can push the development of the study and practical application of the CFRT, and the results of the study can be referenced by the practical engineering.This paper presents a thorough study of a new square steel tubular filled with steel-reinforced concrete column-beam Cross-shaped node, the main achievements are obtained as follows:(1) This paper summarized current research status of the Concrete filled steel structure and the steel-reinforced concrete structure at home and abroad, and especially introduced the study of the square steel tubular filled with steel-reinforced concrete column-beam nodes in detail.(2) This paper designed three Cross-shaped nodes. A series of valuable results were derived through the experimental study through the sub-assemblage loading tests on the nodes, such as hysteretic curve, skeleton-frame curves, stiffness degradation curves, energy dissipation factor, displacement ductility and so on. And the seismic performance of these nodes is revealed in this paper.(3) This paper also analized the seismic performance and damage mechanism of these nodes through change the tube thickness, hoop coefficient, the ratio of axial compression stress and concrete strength.(4) This paper established a simulation model of one of the nodes by ANSYS.To mode the same boundary conditions and load conditions as the experiment, we get the stress cloud charts, hysteretic curve and the skeleton-frame curves.(5) To compare test result and FEM result, it proved to be in good agreement with each other. This result provides theoretical support for the test result.