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Fatigue Behavior of Offshore Topside Structure  

Im, Sung-Woo (Research Institute of Industrial Science and Technology(RIST))
Park, Kwan-Kyu (Inha University Graduate School)
Park, Ro-Sik (Ulsan University)
Cho, Won-Chul (Chungang University)
Jo, Chul-Hee (Inha University)
Publication Information
Journal of Ocean Engineering and Technology / v.20, no.6, 2006 , pp. 88-92 More about this Journal
Abstract
Large-scale model tests of welded topside joints were carried out to observe the fatigue behavior of API 2W Gr.50 steel produced by POSCO. The fatigue crack behaviors for various loading conditions were measured and investigated around the critical joint sections. The experimental results have been verified with numerical approaches and also compared with the AWS D1.1 and DnV RP-C203 design curves. The large-scale experiment models were fabricated, based on the actual operating east area fixed platform. The dimensions of the models were slightly modified to accommodate the test facilities and capacities. The fatigue test was carried out having ${\Delta}Q$ of T1=705.6kN, T2=749.7kN and T3=793.8kN. The three specimens were statically loaded 20 times, with various loadings of about 50kN intervalsbetween the maximum and minimum loads required in the fatigue tests. This loading removed the residual stress in the specimen before the fatigue tests. The topside joint crack was initiated from the brace heel, where the maximum tensile stress occurred. The API 2W Gr.50 steel satisfied the AWS D1.1 detail category C and DnV RP-C203 detail category F ${\Delta}S-N$ curve.
Keywords
Topside structure; Fatigue behavior; Finite element method; API 2W Gr.50;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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