Experimental Research And Numerical Simulation On Seismic Performance Of The Joints With 600MPa High Toughness Reinforced Concrete

Seismic damage data shows that most concrete frame failures occur at the nodes of the frame.In this article,four middle node components with 600 MPa high strength and high toughness are designed according to "Code for Design of Concrete Structures"(GB50010-2010).Under low cyclic loading,the effects of different axial compression ratios,shear compression ratios,reinforcement characteristic value on the mechanical behavior and seismic performance of joint members are considered.The damage characteristics,joints stirrups strain,joint core concrete strain,joint core shear deformation and other mechanical performance indicators of four joint members are compared in this article,seismic and other performance indicators including hysteresis property,skeleton curve,bearing capacity,displacement ductility,stiffness degradation,energy dissipation,cumulative damage of four node specimens are carried out a detailed test analysis.Test studies have shown that: the destroyed regulation in 600 MPa high toughness reinforced concrete beam-column nodes is similar with the destroyed regulation in ordinary reinforced concrete beam-column nodes.And in the case of configuring the appropriate stirrups in node area,controling axial compression ratio and shear compression ratio,beam-column joints have good deformability,energy dissipation capacity and ductility.Within a certain range,appropriately increase reinforcement characteristic value,appropriately decrease axial compression ratio and shear compression ratio of node specimens with 600 MPa grade high strength high toughness reinforced concrete can improve hysteretic characteristics of the structure or structural members,effectively control the shear deformation of the nodes,improve node ductility,delay node stiffness degradation,reduce the cumulative damage of structure or structural members,and will help the beam-column joints improve the ability to resist deformation,which will conducive to seismic.The numerical simulation was carried out by using ABAQUS finite element analysis software.The output displays that the characteristic points of the simulation are in good agreement with text results.