Study On Behaviour Of Perforated Aluminium Alloy Circular Hollow Section Flexural Members

As a new type of building material, aluminium alloy is being used increasingly in structural applications, because of its light weight, easily modeling, high specific strength, excellent anti-corrosion performance and good cyclicity; the researches focused on mechanical performance of the basic components have also become an important work in a lot of major scientific research units. The investigations conducted on aluminium alloy members subjected to axial compression have developed deeply and widely no matter at home or abroad; however the domestic researches of aluminium alloy flexural members have just started. There are little researches of the aluminium alloy perforated flexural members in domestic, especially perforated tubular members. To increase floor height, we set holes on beams, making the pipes, power lines or other equipments pass through the beams easily. The holes will weaken the section dimension and destroy the geometric continuity of structures; the stress will increases greatly in the vicinity of holes, causing great difference of stress distribution and buckling mode between closing members and perforated members. Therefore, it is very necessary that the analysis are studied for the aluminum alloy perforated flexural member.This paper focuses on the experimental study and finite element analysis of mechanical performance of aluminum alloy flexural circular tubes under the vertical load. This paper mainly explained the following works:(1)A total of 4 groups of aluminium alloy circular tubes were tested; 2 groupss were for three-point bending tests and other 2 groups were for four-point bending tests. In the process of tests, we monitored the changes of load, displacement and strain of the specimens, analyzed the effect produced by the holes of the bearing capacity and failure mode of the specimens.(2)Aluminium alloy perforated flexural circular tubular model was established by using the finite element analysis software ANSYS, considering the member’s initial geometric imperfection. The agreement between experimental results and finite element analysis results verified the accuracy of finite element analysis models.(3)We analysis the geometric parameters of the aluminium alloy tubular flexural members by finite element analysis method to research the influence produced by the difference of the diameter-thick ratio, number of holes, diameter of holes, and length-diameter ratio of specimens on the mechanical property of the specimens. On the basis of plenty of geometric parameter analyses, put forward suggested calculation formulas of the aluminium alloy perforated circular tubular and flexural members under three-point bending loads, consulting the direct strength method.