| Through modern manufacturing,transportation,installation and management,the construction industrialization can increase the utilization rate of mechanical equipment,reduce labor,improve construction speed,reduce project cost and improve the construction quality.Steel structure,as one of the important structural forms to promote the development of building industrialization,has the characteristics of standardization of component design,factory production,logistics of transportation,professional installation,high construction efficiency and less construction waste.Steel structure is widely used in industrial plants,high-rise buildings,large-span space structures and other fields.Beam column joint is an important part of the steel structure,which is directly related to the safety of the structure.In the seismic design of structure,in addition to ensuring life safety and reducing economic loss,it is necessary to improve the quick recovery capacity of the structure after extreme disaster.By optimizing the connection form of beam column joints,the recovery capacity of steel structure after disaster can be effectively improved.In this paper,the "up welding and down bolt" beam column joints are taken as the research object.The upper flange of the joint is connected by butt weld,and the lower flange is connected by high-strength bolts through the energy dissipation splicing plate.The "up welding and down bolt" beam column joints not only improve the seismic performance of the joints,but also realize the quick repair ability of the structure after disaster.In this paper,ABAQUS finite element analysis software is used to simulate the components: the element type selected by the component is three-dimensional solid element(c3d8r),the stress-strain constitutive model adopts the two fold follow-up reinforcement model,and the loading mode is displacement control loading.The influence of the thickness of high ductility and O-type splice plate(t)and the height of straight section(h)of O-shaped plate on the failure pattern,ultimate bearing capacity,hysteresis performance,skeleton curve and energy consumption capacity of "up welded and lower bolt" beam column joints are studied.The main research contents are as follows1)Twelve specimens were designed to study the seismic performance of "up welded and bolted" beam column joints with high ductility splicing plates.Six of them were used to study the single layer high ductility splicing plate with the same material,and 6 for the study of multi-layer composite high ductility splicing plate.The results show that the deformation of frame beam and frame column is basically kept in elastic deformation range under the action of load.It shows that the joint can effectively protect the main structure from damage;the high energy consumption splicing plate and beam are connected with bolts,which is convenient to dismantle and can be repaired quickly after earthquake;the hysteresis curve of each model is formed The shape is basically similar,showing a stable and full state,and the ductility coefficient is above5.0,indicating that the node has good energy consumption and ductility performance;for single layer high ductility splicing plate of the same material,the performance of high energy consumption splicing plate made of stainless steel is the best;the research on the thickness of high energy consumption splicing plate of stainless steel shows that the ultimate bearing capacity of 8mm thick stainless steel splicing plate joint The rigidity and ductility of the joints are poor.The difference between the ultimate bearing capacity,rigidity and ductility of the joints of the 12 mm and 14 mm thick stainless steel panels is not significant.In order to ensure economic benefits,it is suggested that the thickness of the stainless steel splicing plate is 20%-40% thicker than that of the ordinary steel plate;for the multi-layer high ductility splicing plate,the composite is the best of the aluminum magnesium alloy splicing plate;then 20 is followed by 20# Steel,stainless steel,Q235 grade steel,copper zinc alloy.2)Eight finite element models were designed to study the seismic performance of "up welded and bolted" beam column joints of O-shaped splicing plates.The results show that the failure of the specimens is mainly concentrated on the o-section of the O-shaped splicing plate;the shape of the hysteresis curve of each model is stable and full,the ductility coefficient is more than 5.5,and the joints have good energy consumption and ductility performance;with the increase of thickness(t),the ultimate bearing capacity,rigidity and ductility of the specimens increase,and the energy consumption performance decreases slightly;the height of the straight section of the O-shaped plate is slightly reduced;the height of the straight section of the O-shaped plate is higher than that of the O-shaped plate(h)The increase of the joint has little influence on the ultimate bearing capacity and stiffness degradation of the "upper welding and lower bolt" beam column joints;the energy consumption and ductility of the joints increase with the increase of height(h);the O-shaped energy consumption splicing plate can effectively avoid the damage of the frame beam and frame column structure in earthquake and realize the rapid repair after disaster. |
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