Research On Damping Ratio Of Fully Welded Aluminum Alloy Beam-column Joints

Aluminum alloy has the characteristics of light weight,glossy appearance,easy processing,strong corrosion resistance and reusability.It is not only used in peripheral structures such as doors and windows,curtain walls,etc.,but also can be used as a structural member to bear loads.In the past two decades,it has been widely used in the fields of construction and civil engineering.Aluminum alloy beam-column joints,as the core of the component,play a vital role in the hysteretic performance,energy consumption performance and damping performance of the structure.However,at present,there is less research on the damping ratio of all-welded aluminum alloy beam-column joints in China,and there is no corresponding standard,which will restrict the development of aluminum alloy in the construction industry.Therefore,in this paper,through experiments and finite element simulation analysis,aluminum alloy profiles with square tube sections commonly used in engineering are studied.Based on this,the commonly used H-shaped sections are also analyzed,and a finite element model is established to analyze all-welded aluminum alloy beams and columns.The damping ratio of the joints.The main contents of this paper are as follows:(1)An experimental analysis was carried out.The parameters of the hysteresis curve,load capacity,energy dissipation coefficient,equivalent viscous damping ratio and other parameters of the beam-column joints of four fully welded aluminum alloy square tube sections were obtained through experiments.Analyze the energy consumption performance of the node and the damping ratio performance of the node.The test results show that: for specimens with different beam sections,when the beam section is continuously increased,the bearing capacity is continuously improved,but the energy consumption capacity of the joint is gradually reduced,and the damping ratio of the joint is also reduced.(2)A finite element model of the square tube cross section of a fully welded aluminum alloy beam-column joint with the same dimensions as the experimental design was established.The hysteresis curve,bearing capacity,energy dissipation coefficient,equivalent viscosity of the experimental results and the finite element simulation results were compared.The performances of hysteresis damping coefficient and damping ratio of nodes verify the reliability of finite element analysis.(3)The finite element software is used to simulate and analyze the damping ratio performance of a fully welded aluminum alloy beam-column joint with a square pipe section equivalent to an H-section.The analysis shows that the energy dissipation coefficient and equivalent viscous damping coefficient calculated by the finite element of the equivalent section and the original section are not much different.It also shows that the H-shaped section also has good damping ratio performance at the joints.(4)Finite element simulation analysis of beam-column joint specimens with H-shaped cross-sections commonly used in engineering.At the same time,the influence of beam section size on the damping ratio of fully welded aluminum alloy beam-column joints was analyzed.Finite element simulations found that the remaining parameters were unchanged.As the beam height increased,the energy dissipation coefficient of the nodes gradually decreased,the equivalent viscous damping coefficient gradually decreased,and the damping ratio performance of the nodes also weakened.