Study On Stiffiness And Deformation Of TEMCOR Joints In Aluminum Alloy Spatial Grid Structures

Compared with steel materials,aluminum alloy has advantages in light weight,high strength and corrosion resistance,and is more consistent with green characteristics.Therefore,aluminum alloy has been widely applied and promoted in recent years.In the aluminum alloy single layer latticed shell structure,there are relatively few studies on the stress mechanism,failure mode,stress distribution and carrying capacity and flexural performance of TEMCOR joints under domestic conditions,lacking relevant experimental research and theoretical research.In this paper,the stiffness and deformation properties of TEMCOR joints of aluminum alloy latticed shell structures are studied by means of experimental research,numerical simulation and finite element parametric analysis.The main research contents are as follows:(1)In this paper,static loading tests of 5 TEMCOR joints(include one specimens extending six long limbs,two specimens extending single long limb box type rod,and two specimens extending single long limbs)are carried out.Stress and strain measurements are measured by sticking strain gauges in the joints area.By placing the displacement meter on the node area and the bar,the load displacement curve and the moment rotation curve of TEMCOR joints are calculated,and the stiffness and deformation performance of TEMCOR joints are finally analyzed.(2)Through the large general finite element software ABAQUS,5 full-scale specimen nonlinear models were established for finite element analysis,and the results were compared with the corresponding test joints to verify the reliability of finite element model analysis.In addition,the stiffness and deformation properties of TEMCOR joints are studied by the comparison between the ideal rigid joints model and the corresponding test joints.(3)Based on the finite element nonlinear model of six long limbs,the static loading mode is adopted by establishing the TEMCOR joints model with different parameters.The influence of the thickness of the joint disk,the height of the section,the thickness of the flange and the thickness of the web on the stiffness and deformation of the aluminum alloy TEMCOR joints is analyzed.The main results are as follows:(1)The force transfer mechanism,failure mode and stress distribution characteristics of TEMCOR joints are obtained under different loading modes.TEMCOR joints are brittle fracture at the time of failure,with sudden failure and no obvious signs.(2)By comparing the initial rotational stiffness of TEMCOR joints and the corresponding rigid joints,it is known that TEMCOR joints have high stiffness,which are all semi-rigid connections.(3)According to the results of the parameter analysis,the stiffness and deformation properties of the aluminum alloy TEMCOR joints can be improved by increasing the section height,the thickness of the web and the thickness of the flange.