Abstract
In this paper, a set of simplified design formulae and graphs are presented to facilitate the determination of Stress Concentration Factors (SCFs), and hence the fatigue behaviour, of welded Circular Hollow Section (CHS) and Rectangular Hollow Section (RHS) uniplanar and multiplanar K-connections. This set of design formulae and graphs is based on a rational hot spot stress approach for hollow section connections, presented earlier in this journal [J. Construct. Steel. Res. 35 (1995) 71], and a very complex and comprehensive set of SCF formulae, also previously published in this journal [J. Construct. Steel. Res. 43 (1997) 87]. These formulae had been based on extensive Finite Element analyses and verified against independent test results. In addition to the design graphs, another new aspect of this paper is that — unlike earlier publications — a unified approach in terms of the S r h.s. − N f line and thickness correction has been derived, for both RHS and CHS connections. The design graphs and S r h.s. − N f line contained in this paper are destined to be an important component of the upcoming CIDECT Fatigue Design Guide and International Institute of Welding (IIW) Fatigue Design Recommendation for welded hollow section connections.
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