Experimental Study On Mechanical Properties Of Aluminum Alloy Tubular (Circular) Concrete Short Columns Under Axial Compression

At present,the concrete-filled steel tube structure is more common in the domestic and foreign building structures,because it has good mechanical properties and has been widely used,but the corrosion of concrete-filled steel tube may bring huge hidden danger to the structure,and even cause structural damage.Looking for a new alternative material can effectively solve this problem.Aluminum alloy material has good corrosion resistance,so it has entered people's field of vision.Aluminum alloy pipe concrete is a new type of composite structure.Aluminum alloy pipe(circular)concrete short column is a component composed of aluminum alloy pipe and core.When the component is subject to axial load,aluminum alloy pipe and core concrete can interact,aluminum alloy pipe plays a constraint role on the core concrete,and the core concrete can delay the buckling of aluminum alloy pipe.In order to understand the mechanical properties of aluminum alloy concrete short columns under axial load,the main research contents of this paper include the following aspects:(1)Based on the experimental study of the mechanical properties of five aluminum alloy tubular(circular)concrete short columns under axial load,the load displacement curve and load strain curve are measured,the failure mode of the specimens is investigated,and the influence of the specimen parameters on the mechanical properties is analyzed.The results show that the aluminum alloy tube(circular)concrete short columns have high strength,ultimate bearing capacity and good ductility.At the same time,the constraint effect coefficient of aluminum alloy tube,the aluminum content of the specimen and the strength grade of core concrete have influence on the bearing capacity of the specimen.(2)The finite element software ABAQUS is used to model and analyze the aluminum alloy pipe(circular)concrete short column.At the same time,the research is extended to consider the influence of different test pieces on the mechanical properties of the test pieces when the parameters are changed.The results show that the results of finite element calculation are in good agreement with the test results,which verifies the accuracy of finite element simulation.At the same time,it is found that the ultimate bearing capacity of the specimen increases with the increase of the wall thickness of the aluminum alloy tube.(3)On the basis of experimental research and finite element simulation,this paper uses the calculation method of bearing capacity of concrete filled steel tubular short columns to test the aluminum alloy tubular(circular)concrete short columns,and analyzes whether the three theories(quasi concrete theory,quasi aluminum alloy theory and unified theory)can be applied to the calculation of bearing capacity of aluminum alloy tubular concrete members.The results show that the calculated results of the bearing capacity of aluminum alloy tube(circular)concrete short columns by using the pseudo concrete theory are close tothe measured values,and the calculated results of the pseudo aluminum alloy theory and the unified theory have larger errors compared with the measured values.