Application And Research Of Eccentric Tubular Joints

Eccentric Tubular Joint which is a kind of joint is usually used in a place where primary and secondary truss intersects or out-plane elements brace. However, the present code GB50017-2003 does not give information about how to design these joints. This paper makes a comprehensive and systematic analysis about the static behavior of eccentric tubular joints by ANSYS program which takes material and geometry nonlinearity into account.The main content of the research in this article is as follows.(1)The ANSYS model of this joint is made. In the modeling course, the influence of different boundary conditions, mesh generations and loading methods on the bearing capacity is mainly considered. After that the finite element model which is the closest to reality is determined. Through the analysis and study of the finite element model of ANSYS, the result shows that the finite element model of Eccentric tubular Joints used in this paper can better simulate mechanical behavior of practical joint.(2)Based on the analysis of finite element results, this paper summarizes the failure modes and analyzes the mechanical properties of the eccentric joints. This paper mainly studies the effect of 4 dimensionless parameters on ultimate bearing capacities, including ratio of diameter to thickness γ, diameter ratio of primary to secondary tubes β, ratio of eccentric manifolds and director of distance e, ratio of axial force to totally section yield axial force n. Analysis shows the influence of all parameters on the bearing capacity of this joint. While the primary tube is compressed, the ultimate strength of eccentric tubular joints decreases. This paper suggests φn could be used to calculate the decreased degree.(3)By means of least square method, ultimate load under eccentric joints damage with each parameter through nonlinear correlation is made. And on this basis, the design formulas about the ultimate bearing capacity of eccentric tubular joints are proposed. The rationality of the formulas is verified.