Seismic Performance Analysis Of Reinforced Concrete Joints Of Prefabricated Assembly Steel Connection

As the rapid development of assembled concrete in China,The researches on prefabricated construction are getting deeper.This article puts forward a RC joint of steel end connectors which is prefabricated assembled,Steel in node areas are connected by screw bolts.The installation speed of the site can be effectively improved and the quality of construction can be guaranteed by adopting screw bolts.The joint can provide sufficient strength for subsequent construction and speed up the construction progress after its installation.This paper uses ABAQUS to research aseismatic performance of this joint by establishing different type of boundary node numerical model,The main contents and conclusions are as follows:(1)The author used ABAQUS to establish some numerical models of reinforced concrete side node with steel connection,and applied low cyclic loading on the beam-end to analysis the stress variation of steel and concrete,the damage form and the hysteretic curve of the side node.Reinforced concrete joints with steel connection have the advantages of good ductility and large stiffness compared with common reinforced concrete joints.The steel connection strengthens the core area of the joint,and the joint failure occurred on the intersection of steel connection section and reinforced concrete section,it just accord with the thought of seismic design called Strong node and Weak member,Strong column and Weak beam.(2)The author applied low cyclic loading with opposite direction on the beam-end of the middle node of the reinforced concrete with steel connection,and the existence of steel connection improved the seismic performance of the middle node obviously compared with the middle node ordinary reinforced concrete.The failure of the middle node with steel connection occurred on the reinforced concrete section of lower column,and no damage occurred in the core area of the node.(3)The reinforced concrete side nodes with steel connection have better seismic performance and higher research value,so the author research the influence on nodal seismic performance by axial compression ratio?the tength of steel connection and the tength of reinforced concrete section in the beam.The greater the axial compression ratio is,the smaller the ultimate bearing capacity and the ductility of the side nodes will be.When the tength of steel connection in the beam is longer,the damage of the reinforced concrete section of the lower column is more erious,it might even bedamaged.The longer the reinforced concrete section on the beam is,the smaller the ultimate bearing capacity of the side joints will be.