| Aluminum alloy not only has excellent anti-corrosion ability,but also can be recycled.It is widely used in bridges,coastal areas and chemical industries.In recent years,with the advancement of metallurgical technology,the strength of aluminum alloy has also been greatly improved.This means that aluminum alloy can be used as the main load-bearing member in the frame structure.Nodes are the stress points of the frame structure,which is the top priority of the overall frame.The welding of aluminum alloy nodes will greatly reduce the material's stress performance.The use of rivet connections and ordinary bolt connections will make the node's stiffness too low,and high-strength bolts.The connection is undoubtedly the best choice for the connection of aluminum alloy nodes.Although the pre-tensioning force of high-strength bolts has been considered in the past research,it will damage the surface of the aluminum alloy and cause the loss of the pre-tensioning force of the connection nodes.Large washers and other methods can be used to minimize the impact of pre-tightening force on the aluminum alloy bolt connection,and the application of high-strength bolts in aluminum alloy beam-column connection nodes becomes possible.The study of aluminum alloy high-strength bolt connection nodes can not only complete the problems of related research and experimental gaps,but also greatly promote the application process of aluminum alloy structures in the field of civil engineering construction.Therefore,6061-T6 aluminum alloy H-shaped beams and columns are selected in this paper.The aluminum alloy angled pieces are used.The stainless steel connectors are connected by high-strength bolts.The hysteretic performance test of aluminum alloy high-strength bolted joints is performed.Analysis,mainly completed the following tasks:(1)The mechanical properties of 6061-T6 aluminum alloy column flanges,column webs,beam flanges,beam webs and angled pieces were studied through tensile tests of material mechanics,and a suitable constitutive model was selected.(2)Carry out the hole wall pressure test and anti-slip coefficient test of aluminum alloy plate parts,and obtain the standard value of hole wall pressure of aluminum alloy plate parts and the anti-slip coefficient when the surface of high-strength bolted aluminum alloy plate parts is not treated.(3)Designed 6 sets of cyclic loading aluminum alloy solid-belt high-strength bolted joints,5 different types of connections,namely full-angle aluminum bolted beam-column nodes,top and bottom stainless steel angled parts,web-angled aluminum bolted beam-column nodesAll-stainless steel corners are bolted to beam-column joints,T-stainless steel bolts are connected to beam-column joints and stiffener top and bottom stainless steel corners are bolted to beam-column joints The applicability of different high-strength bolted joints in aluminum alloy structures is studied,and the energy dissipation capacity,deformation characteristics and failure modes of different types of high-strength bolted joints in aluminum alloys are clarified.(4)Based on the hysteretic performance test results of aluminum alloy high-strength bolted joints,a more accurate finite element model was established,and the deformation,energy consumption,and stiffness of the jointed joint model under different parameters were investigated.Through sorting and analysis,it was obtained Influence of different parameters on the performance of connected nodes,and give design suggestions.(5)According to the test and finite element analysis results,the selection principle of aluminum alloy beam-column high-strength bolt connection node type is proposed,and the hysteretic calculation model of aluminum alloy high-strength bolt connection node is proposed. |
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