Study On Mechanical Behavior Of Connection Joint Between Reinforced Concrete Sheer Wall And Steel Beam

In the shear wall structure system,the connection joint between reinforced concrete shear wall and coupling beam is the key part and the previous earthquake damage indicates that structural damage occures mostly in the node region. In recent years,the steel-concrete hybrid structure has also been widely used in high-rise buildings and the RC shear wall with steel coupling beam is one of its applications. The performance of steel and concrete varies greately and studies on a node composed by the steel and concrete are not comprehensive enough.In this paper, the entity modeling method is used to finite element numerical simulation analysis by using ANSYS software for the connection joint between reinforced concrete shear wall and coupling beam. The finite element model of 13 specimens is established to consider the influences from shear span ratio of steel beam,steel intensity, axial compression ratio of shear wall and steel flange thickness, to deeply analyze bearing capacity and ductility under monotonic loading as well as hysteretic behavior, skeleton curve,stiffness degradation and dissipation capacity under cyclic loading and to analyze the stress distribution of shear wall and steel beam.Research indicates that the nodes' bearing capacity, ductility and stiffness have greatly improved with the shear span ratio of steel beam decreases,but there's no importantce for dissipation capacity, so reduce the shear pan ratio properly in certain extent on the premise of saving material; increasing steel strengh can improve bearing capacity but ductility and dissipation of nodes deteriorate, nodes destruction dosen't meet “strong node and weak component” principle and material is not fully utilized, therefore beam intensity is not too large; when axial compression ratio of shear wall is larger than 0.3, mechanical behavior of nodes deteriorates and nodes damage also don't meet “strong node and weak component”principle, so it recommends that axial compression ration does not exceed 0.3 in practicaldesign; increasing steel flange thickness could improve the bearing capacity, but ductility,hysteretic bahavior and dissipation capacity deteriorate, so recommend steel flange thickness between 14-16 mm.This paper deeply analyzes the connection joint between reinforced concrete shear and steel beam under monotonic and cyclic loading, the conclusion of the node for the theoretical research and engineering application has a certain reference value, laid a good foundation for further study.