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.
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