Seismic Performance Analysis Of Prefabricated Reinforced Concrete Frames Based On Damped Beam-column Joints

Prefabricated buildings have the advantages of short construction period,convenient and efficient construction,saving resources and environmental protection.In recent years,industrialization has become an inevitable trend in the construction industry.According to the green building construction principle of "four sections and one environmental protection",a prefabricated reinforced concrete frame with damped joints is proposed in this paper.The damped joint has good energy dissipation and vibration absorption effect,and has better ductility performance,which can effectively avoid brittle failure of prefabricated structures under earthquake.Moreover,the failure mode of prefabricated structures can be controlled and adjusted by changing the parameters of different components at the joints.The application scope of prefabricated reinforced concrete frames with damped joints is relatively wide.Based on a large number of research achievements at home and abroad,combined with the test and finite element simulation,this paper conducts an in-depth study on the prefabricated structure.The main contents and conclusions are as follows:(1)In this paper,we design the assembly framework of damped node,build the finite element model through ABAQUS model,and analyze the seismic performance of the framework.On this basis,the hardness of the rubber gasket,filling material,axial pressure ratio,rubber gasket thickness and rib thickness are changed to analyze the seismic performance of the damping node prefabricated frame.The results show that the rubber pad thickness has less impact on the seismic performance of the frame;the peak load and energy consumption capacity of the filled concrete and steel plate frame at the node are relatively high,but the ductility performance is poor,preferring brittle failure;the greater the axial pressure ratio is,the peak load of the assembled frame is smaller,and the failure mode of the prefabricated frame is changed to the rib yield failure;the larger the thickness of the rubber gasket,the better the ductility of the damping node frame;the larger the thickness of the rib,the less the ductility of the assembled frame.When the thickness of the rib is small,the failure mode of the frame changes to the flexion failure of the rib.(2)In the low weekly reciprocating loading test of the frame,the failure mode,hysteresis curve,skeleton curve,stiffness degradation and energy dissipation ability of the frame were studied,and the accuracy of the finite element model was verified.(3)To build three layers of damping type node prefabricated reinforced concrete frame finite element model,by adding two or three rib thickness and reduce the thickness of the two or three layers of rubber,the three layers of frame deformation and stiffness,which realizes the coordinated deformation,and compared with the original three frame,optimize the three layers of seismic performance of each layer into full play.