Nonlinear Finite Element Analysis of Diamond Bird-Beak TX-Joints

Abstract

Abstract. The diamond bird-beak TX-joint is a novel configuration for tubular structures and there are few correlated papers for it. Non-linear FE analysis is carried out on axially loaded TX-joints in order to study the local static behavior of this type of joint. The individual influence of the following geometric parameters on the joint capacity, section width ratio β of brace to chord members, section width to wall thickness ratio 2γ of chord member, and wall thickness ratio τ of brace to chord members is made clear. Increasing either β or τ will enhance the joint capacity and increasing 2γ will lower joint capacity. A reduction equation is proposed to consider the load effect of chord and the axial forces of out-of-plane braces. The tension of out-of-plane braces always lowers the ultimate capacity of joint. The same tension and compression have the equal influence on the joint capacity.

Finite element analysis and formulae for stress concentration factors of diamond bird-beak SHS T-joints

“…Davies et al [10] focused on the effect of purlin loads on the capacity of overlapped diamond bird-beak K-joints. Zhu et al [11] and Liu et al [12] conducted FE analysis to estimate the ultimate capacities of axially loaded diamond bird-beak TX-and XX-joints. FE analysis was carried out by Peña et al [13] to study the ultimate load capacity of diamond bird-beak X-joints subjected to axial forces.…”

Numerical investigation on stress concentration factors of square bird-beak SHS T-joints subject to axial forces

“…Tremendous efforts including Ono et al [1][2][3], Ishida et al [4], Davies et al [5], Owen et al [6,8], Owen and Kelly [7], Chtistitas [9], Lei [10], Zhu and Liu [11] have been devoted to the ultimate resistance of bird-beak joints under static loads, and it shows that the ultimate strengths of bird-beak joints are obviously higher than those of conventional joints with the same non-dimensional parameters. The seismic resistance of bird-beak joints was also studied by Hall and Owen [12], where both conventional and diamond bird-beak X-joints were tested under inelastic cyclic loading, and better performance were observed for new configurations.…”

Stress concentration factors and fatigue behavior of square bird-beak SHS T-joints under out-of-plane bending

“…Christitsas [9] and Lei [10] conducted experiments and a parametric FEM analysis of square bird-beak X-joints subject to in-plane bending and proposed formulas for design resistance as a result. Zhu and Liu [11] studied the non-linear behavior of axially loaded diamond bird-beak XT-joints using a finite element method. The studies indicated that the ultimate strengths of bird-beak joints were higher than those of conventional joints with the same non-dimensional parameters.…”