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