Seismic Performance Analysis Of Prefabricated Plastic Controllable Joint And Its Steel Frame

As one of the most harmful natural disasters in the history of mankind,earthquake disasters are random,unpredictable,and directly affecting a wide range of impacts.They have long caused major threats to human survival and economic and social development.Especially in recent years,frequent ground-based disasters often lead to massive destruction of building structures,resulting in countless casualties,and the amount of property economic losses is particularly huge.In the post-earthquake investigation of the Wenchuan earthquake,it was found that there were brittle failures on the beam-column joints of many seriously damaged building structures.Since then,the research focus of domestic and foreign experts and scholars has focused on how to move the plastic hinge of the beam-column joint outward to the beam section away from the near-column end.For some building structures under the action of large earthquakes,we require only a few simple repair processes to quickly restore the performance of such structures.Under this background,this paper proposes a new type of plastic controllable joint at the end of the prefabricated assembly beam based on the principle of mechanical connection.This joint can be applied to the assembled steel frame structure to make the steel frame structure plastically controllable and energy consuming.At the same time with good characteristics,it is also easy to install and remove.The beam-column joints are first connected by pins that can bear vertical loads and can generate a hinge mechanism,and then the upper and lower connecting steel plates at the pin shaft are connected by bolts,and finally the bolts and the composite material rods are connected to the steel plates on both sides.The stiffness andanti-rotation capacity of this beam-column joint are provided by the upper and lower connecting steel plates and composite material rods,which can generate deformation energy consumption and can also bear vertical loads,and various parameters of the joint are easily adjusted during the design of the joint,which can be carried out separately design.For the structure using this plastic controllable node,through reasonable parameter design,it is easy to realize "strong column and weak beam,strong node and weak member" and "easy to install and detach",so that under the action of large earthquakes,the steel plate and composite material are connected up and down the node The plastic deformation of the rod first enters the energy dissipation stage.At this time,the main structural members and other parts of the node are not in plastic deformation and are still in the elastic stage.Most of the deformation and energy dissipation of the structure are gathered at the beam-column nodes.The overall function can be quickly restored by replacing the composite material rods on both sides of the node and the upper and lower connecting steel plates.Based on the traditional prefabricated steel frame,this subject designed a high-performance new prefabricated prefabricated steel frame structure,and analyzed its overall seismic performance in detail.According to the performance parameters such as the bearing capacity,deformation characteristics,failure sequence,energy dissipation capacity and plastic damage development of the structural system,the assembled steel frame structure with new plastic controllable nodes has better performance than the traditional assembled steel frame structure Carrying capacity,ductility and failure sequence,smaller floor lateral displacement and inter-floor displacement angle,structural energy dissipation distribution is more reasonable,and the accuracy of the main plastic development area is reflected in the control of plastic controllable nodes at the beam-column connection On the above,this also verifies the superiority of the assembled steel frame structure with new plastic controllable nodes.