Study On Flexural Behaviour Of Aluminium Alloy SHS Tubular Beams With Openings

In recent years, aluminium alloy structures are developed well and used widely with light weight, beauty, high specific strength, good corrosion resistance and other characteristics, no matter at home or abroad. In building structures, we usually set holes in the web of the aluminium alloy beams in advance, making the power lines or heating pipes pass through the beams conveniently. For beams, holes will have effects on the buckling failure mode, the flexural capacity and stress distribution and so on. Researches on aluminum alloy beams are mostly aimed at imperforated members; and the study of the perforated members is less, especially the perforated tubular components. To understand the bending properties of aluminium alloy tubular beams with holes, it is necessary to do some experimental and finite element analysis study for this type of components.This article explained the experimental study and finite element simulation analysis method of the three-point bending and four-point bending tests which were conduct on aluminium alloy square and rectangular hollow section perforated members. A total of 13 specimens were tested,7specimens for three-point bending test and others for four-point bending test. The phenomenon of local buckling could be observed in all components’ tests. All tests had been carried on the finite element simulation, considering the geometric nonlinearity and material nonlinearity. The results of finite element analysis and experimental results were in good agreement, which proved the accuracy of the finite element analysis of the components. On this basis, the parameter analysis of the perforated aluminium alloy beams was performed by using the finite element models. Firstly, the effect of the different shapes, sizes and numbers of holes on the buckling modes, flexural bearing capacity, stress distribution and others of the beams was analyzed. Then, the effect on the local stability of perforated beams which was produced by the parameters including the size of hole, width ratio of web and flange, the width-thickness ratio of plates and so on was studied. Finally, a large number of simulations verified the accuracy of the calculation method of aluminium alloy square and rectangular section tubes which resulted from national specification and direct strength method.