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J. Ocean Eng. Technol. 2006;20(6):88-92.    

Fatigue Behavior of Offshore Topside Structure
Im, Sung-Woo;Park, Kwan-Kyu;Park, Ro-Sik;Cho, Won-Chul;Jo, Chul-Hee;
Research Institute of Industrial Science and Technology(RIST);Inha University Graduate School;Ulsan University;Chungang University;Inha University;
상부 해양 요소 접합부의 피로 평가
임성우;박관규;박노식;조원철;조철희;
포항산업과학연구원;인하대학교 대학원;울산대학교;중앙대학교;인하대학교;
© 2006 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Topside structure, Fatigue behavior, Finite element method, API 2W Gr.50
핵심용어: 상판 구조물, 피로 성능, 유한요소법
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.


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