Experimental Study On The Seismic Performance Of Recycled Concrete-filled Steel Tubular Column And Steel Beam Node

Recycled concrete-filled steel tube structure can not only combine the advantages of steel tube and concrete, but also can make full use of the construction waste, this structure has broad prospects. But the study of this kind of structure is still in its infancy, especially to the steel tube recycled concrete beam-column joints research is insufficient. The rapid development of high-rise building puts forward higher requirements on beam-column joints, so it is particularly important to research on this kind of structure about the form of the node.In this paper, the author set different nodes form and overhanging length and thickness of the reinforcing ring as the parameters, design four recycled concrete-filled steel tube column-steel beam with outside reinforcing ring specimens, through the low cyclic loading tests to study the seismic performance of this node, and provide theoretical basis for the research of this type of node. By using the finite element software ABAQUS to simulate the specimens of the nodes, verify the feasibility of the simulation, and to lay a solid foundation for the extended analysis.The main conclusions are:(1) Reinforcement ring can significantly improve the seismic performance of the node. The finally results show that the overhanging length of reinforcement ring within a certain range has a great influence on seismic performance of node, namely, the longer overhanging length of reinforcement ring, the better of the seismic performance, the thickness of the reinforcement ring has a little influence on the seismic performance of the nodes.(2) Eliminate the effects of welding on the test, the specimen is damaged mainly because the plastic hinge appear at which beam and reinforcement ring contact, and the steel beam flange appear buckling failure because of the instability destruction.(3) Using finite element analysis software of ABAQUS simulation, the test result has good agreement with the simulation result, and the result indicates the feasibility of finite element analysis software.(4) Through the extend analysis we know that the replacement rate of recycled coarse aggregate have little impact on the seismic performance of nodes, we can use the recycled coarse aggregate to replace natural coarse aggregate; the increase of axial compression ratio or the decrease of the beam and column stiffness ratio have negative effect on the seismic performance of the node.