Study On Seismic Performance Of Slabs On Fabricated Concrete Metal Connection Joints

In the existing prefabricated prefabricated concrete frame structure,there are problems such as weak seismic performance of joints and difficulties in safe construction.Based on the research on the prefabricated prefabricated metal energy-dissipation connection system,an open floor slab was added and passed the test with the method of simulation and analysis,the parameters of floor openings and dampers on the joint performance and its influence are analyzed.The main research contents are as follows:(1)A metal energy-dissipation connection node with floor slabs installed and openings and without floor slabs was made,and a pseudo-static test study was performed on them.The research results show that the floor slab can protect the upper flange plate of the node metal effector,avoid local buckling instability,and improve the compressive bearing capacity of the component.(2)Finite element analysis of metal energy dissipating nodes with slabs.The research parameters are the opening size of the slab,the slab thickness,the slab reinforcement,the distance between the slab and the damper,and the thickness of the upper flange of the damper.Flange weakening depth,upper flange weakening length,upper flange width,lower flange width,lower flange weakening length,and lower flange weakening depth.The research results show that,for the floor,changing its thickness,reinforcement,and opening size does not have a great impact on the energy dissipation of the metal energy absorber and the bearing capacity of the component;as the distance between the floor and the damper continues to increase,the bearing capacity of the component and The initial stiffness is constantly increasing;for the upper flange plate,changing its weakening depth,thickness,weakening length and width has no significant impact on the bearing capacity of the member and the energy dissipation capacity of the energy dissipator;for the lower flange plate,changing its weakening length,Width and weakening depth can greatly affect the bearing capacity,initial stiffness and ductility of the component.Among them,when the width of the lower flange plate is changed,the bearing capacity of the component has the largest impact.As the width of the lower flange continues to increase,the load The force is constantly increasing,and the hysteresis area is increasing.