Research On The Effect Of Stiffeners On The Wind Resistance Of Aluminum Panel Curtain Wall

As a building envelope,aluminum curtain wall has the characteristics of light weight,corrosion resistance and easy installation.In recent years,it is more and more used in commercial,office and other common buildings.At the same time,more and more attention has been paid to the safety of aluminum curtain wall.The aluminum curtain wall is made up of aluminum panels and stiffeners,which are connected by aluminum welding nails,structural adhesive or adhesive tape,and its connection performance directly affects the wind bearing performance of aluminum curtain wall structure.In this paper,the drawing bearing capacity of aluminum welding nails is studied by experiment and finite element calculation,drawing test and curtain wall wind resistance test under structural adhesive connection are carried outThe main contents are as follows:(1)The drawing tests of aluminum welding nails under different parameters are completed.16 groups of 80 specimens were designed to study the drawing performance of aluminum welding nails with different current(86A,96 A,106A,116A)and different sand paper polishing mesh(0 mesh,80 mesh,120 mesh,160 mesh).The load-displacement curve was obtained,and the failure modes of each specimen under the drawing action were analyzed.The influence law of current and sand paper grinding mesh on drawing capacity of each specimen was studied,and the calculation formula of drawing capacity was put forward.(2)Four groups of structural adhesive with eight different components(semi-rigid structural adhesive,elastic structural adhesive and semi-elastic structural adhesive)were tested.The load-displacement curve was obtained,the influence of alcohol cleaning on the drawing performance of aluminum plate was analyzed,the influence of different structural adhesives on the bonding performance of aluminum plate was studied,and the failure modes of different colloid were summarized and analyzed.By comparing the connection performance of four structural adhesives,providing a theoretical basis for the design of aluminum curtain wall.(3)The wind pressure tests of aluminum curtain wall under 5 different parameters were completed.The relationship between wind pressure and deflection was obtained,and the influence of connection form of stiffening rib and aluminum plate(aluminum welding nail connection,structural adhesive connection,adhesive tape connection)and section form of stiffening rib on wind pressure performance of structure was explored,and the variation law of deflection of aluminum curtain wall at different positions is analyzed and compared.(4)Finite element software Abaqus was used to numerically analyze the drawing performance of aluminum welding nails and the wind resistance performance of aluminum curtain wall,and the stress change and deflection change rule of each specimen were obtained.The stress paths and modal changes of each specimen were analyzed and compared with the calculated results to verify the accuracy of the finite element model.The main conclusions are as follows:(1)Sand paper grinding mesh of aluminum plate surface had little effect on aluminum welding nail.The current had a great influence on the aluminum welding nail,showing a certain regularity.When the current was 106 A,the welding was more stable and the bearing capacity is larger.(2)The tensile capacity of elastic structure was low,but the ductility was good,and it had a certain impact resistance.The tensile capacity of rigid adhesive was high,but the ductility was poor and the impact resistance was weak.Semi-elastic glue ability was more neutral.(3)The connection mode of structural adhesive,adhesive tape and aluminum welding nail has little influence on the deflection peak value of aluminum plate,but has great influence on the deflection peak value of stiffening rib.The section form of stiffening rib has great influence on the performance of aluminum plate against wind pressure,and reasonable design of stiffener section can improve the wind pressure of aluminum plate,reduce the peak deflection of stiffener and aluminum plate,and improve the wind pressure performance of the whole structure.(4)The results of finite element analysis agree well with the experimental results.The stress concentration point can be found by finite element analysis.The optimization design for stress concentration point provides data for its design and engineering application.