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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 102
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Paper 18

Numerical Evaluation of CHS K Joints: A Comparison of Single Node vs. Truss Node

R.S. da Silva1, L.R.O. de Lima2, P.C.G. da S. Vellasco2, L.F. Costa Neves3 and J.G. Santos da Silva2

1PGECIV - Post Graduate Program in Civil Engineering, UERJ, Brazil
2Structural Engineering Department - ESTR, Brazil
State University of Rio de Janeiro - UERJ, Brazil
3Civil Engineering Department, University of Coimbra - UC, Portugal

Full Bibliographic Reference for this paper
R.S. da Silva, L.R.O. de Lima, P.C.G. da S. Vellasco, L.F. Costa Neves, J.G. Santos da Silva, "Numerical Evaluation of CHS K Joints: A Comparison of Single Node vs. Truss Node", in , (Editors), "Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 18, 2013. doi:10.4203/ccp.102.18
Keywords: steel structures, tubular joints, numerical analysis, nonlinear analysis, Eurocode 3, cidect design formulations.

The intensive worldwide use of hollow structural elements, mainly due to their aesthetic and structural advantages, led designers to be focused on better understanding their technological and design issues. Consequently, the accuracy for design methods of this type of structure 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 collapse load predictions lead to unsafe or uneconomical solutions. In this paper a parametric study based on numerical non-linear finite element simulations was developed for the analysis of K tubular joints where both chords and braces are made of circular hollow sections. This paper also proposes the modelling of a truss made with circular hollow section elements to establish a comparison between a single joint and the response of the joint as a part of a full scale truss structure. The proposed models were validated by comparisons with experiments; analytical results recommended by the Eurocode 3; the new CIDECT formulation; and classic deformation limits available in the literature. The key variables of the parametric study were the brace diameter to chord diameter ratio and the chord face thickness to chord diameter ratio. The identification of these key parameters was made based on recent studies that highlighted discrepancies on some Eurocode 3 rules.

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