The intensive worldwide use of tubular structural elements, mainly due to its associated aesthetical and structural advantages, led designers to be focused on technological and design issues. Consequently, their design methods accuracy plays a fundamental role when economical and safety aspects are considered. Additionally, recent tubular joint studies indicate further research needs, especially for some joint geometries. This is even more significant for particular failure modes where the failure load predictions lead to unsafe or uneconomical solutions. In this paper a numerical (i.e. non-linear finite element simulations) based on a parametric study is presented for the analysis of K tubular joints where both chords and braces are made of circular hollow sections. The proposed model was validated by comparison to the experiments, analytical results suggested at the Eurocode 3 and at the new CIDECT formulation and to the classic deformation limits present in the literature. The main variables of the study were the brace diameter to chord diameter ratio and the thickness to chord face diameter ratio. These parameters were chosen based on recent studies results that depicted some Eurocode 3 rules discrepancies.