Research On The Static And Seismic Behavior Of The Joints Of Steel Structures Connected With Outer Ring Clamps And Slots

In recent years,with the comprehensive promotion of China's construction industrialization and the rapid development of urban construction,prefabricated steel structure buildings have gradually become a development direction of buildings.Beam-column joints,as an important part of prefabricated steel structure buildings,have an important impact on the strength,stiffness and stability of structures.In this paper,the bolt connection of outer ring clamping groove is suitable for multi-storey fabricated steel frame structure system.The system adopts standardized beam and column member specifications.The main structural members are connected on site by beam inserted into the column snap slot and connected into the frame as a whole by column snap slot and beam end plate connection bolts.This new type of node is assembled with bolts in the construction site,which is of high construction efficiency and good safety,and avoids the quality and safety risk of on-site welding,which brings great convenience to the construction.In this paper,on the basis of reference literatures at home and abroad,through the theoretical calculation,design the new node basic specimens,and by changing the beam end two parameters,the plate thickness and bolt size design four groups of specimens on the static test and seismic test,from the two aspects of experimental research and numerical analysis study on static and seismic performance of the new node.The main research work is as follows:(1)Static tests were conducted on the two groups of specimens,and the failure mode,bearing capacity,stiffness division and stress-strain distribution of the joints were analyzed.It was concluded that the failure mode of the joints was torn at the joint of the beam flange first,and yield failure of the sleeve plate at the end of the rear beam;The effect of increasing the thickness of the end sleeve of the beam on the ultimate bearing capacity of the joints is obvious.The bearing capacity is increased by 25-60%.The bolt specification has little influence on the ultimate bearing capacity of the joint.(2)Of two groups of specimens,the seismic experiment under low reversed cyclic loading is analyzed node hysteresis curves,skeleton curves,such as strength,stiffness,ductility,energy dissipation,a full node hysteretic properties,seismic performance good conclusion,at the same time,the beam end plate thickness and bolt size on seismic performance of the bearing capacity of the node,and the ring stiffness has a great influence,in the case of other conditions are equal,the node of the yield load,ultimate load and failure load as the beam end of plate thickness and bolt size increases,the excessive increase of beam end plate thickness will be envoys point set of stiffness degradation is accelerated,The bolt specification shall be 24 mm.(3)By ABAQUS finite element software modeling for the test specimen is calculated and compared with the test results analysis,finite element analysis calculation with the test specimen failure mode and the mechanical properties of the basic consistent,and through the further analysis of the parameter,it is concluded that the column connection plate thickness on the mechanical characteristics of node and seismic performance has certain effect,increase the column connection plate thickness can effectively improve the node's stress distribution and seismic performance of the conclusion.