| Aluminum alloy has been used more and more widely in the field of civil engineering due to its advantages of high specific strength,easy processing,beautiful appearance,and good corrosion resistance.The use of aluminum alloy frame structures in residential buildings and other building structures has become more and more widespread,and reliable joint design has a vital impact on the applicability and safety of the structure.For aluminum alloy frame beam-column joints,domestic related research is scarce,and the experimental research on mechanically connecting aluminum alloy beam-column joints is even rarer.Therefore,this article chooses 6061-T6 aluminum alloy H-shaped cross-section beams and columns,uses stainless steel connectors,and uses high-strength bolts to achieve mechanical connection between nodes.The aluminum alloy frame is fully mechanically connected to beam-column nodes under reciprocating load.The hysteresis test,combined with the finite element to further analyze the nodes,mainly completed the following tasks:(1)The mechanical properties of 6061-T6 aluminum alloy and S304 stainless steel were studied by mechanical tensile test;(2)Five groups of cyclically loaded aluminum alloy frame fully-analyzed connection beam-column joints were carried out,namely the top and bottom ribbed corner joint joints with double web corner joints without stiffening ribs between columns(2 nodes),The top and bottom ribbed corner connection nodes(2 nodes)with stiffening ribs and double web corner connectors between the columns and the top and bottom ribbed corners and beams with stiffeners and double web corner connections between the columns The connection node of the web opening(1node).Analyze the seismic performance of various joints,and clarify the hysteretic performance,energy dissipation capacity,deformation characteristics and failure modes of the corresponding aluminum alloy beam-column joints;(3)Based on the load-displacement curves of 5 groups of test nodes,based on the bilinear simplified node hysteresis model,a simplified hysteretic model for aluminum alloy beam-column test nodes is proposed;(4)According to the results of the joint hysteresis test,a reliable finite element model is established,and the whole process of the joint force is analyzed;(5)The parameter analysis of the three types of nodes is carried out considering the influence factors of the column end axial compression ratio,the thickness of the node area and the thickness of the top and bottom corners.The influence law of each influencing factor on the mechanical properties of the node is summarized,and corresponding design suggestions are put forward;(6)Carry out the calculation and analysis of the finite element model calculation example of the aluminum alloy beam-column joints of 36 columns without stiffening ribs with double web corners,top and bottom ribs,and the semi-rigid joint bending moment-angle curve three-parameter model The shape coefficient in the formula is fitted and regression,and the suitable shape coefficient formula for this type of node is proposed,and the influence of the change of different influencing factors on the initial stiffness of the node is further studied. |
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