Assessment of Fatigue Strength Characteristics of Tendon Porch in Offshore Platforms for API 2W Gr. 50 Steel

J. Ocean Eng. Technol. 2006;20(5):82-88.

Im, Sung-Woo;Lee, Joo-Sung;

Research Institute of Industrial Science and Technology;School of Naval Architecture & Ocean Engineering, University of Ulsan;

API 2W Gr.50 강재를 이용한 해양구조물 Tendon Porch의 피로성능 평가

임성우;이주성;

포항산업과학연구원;울산대학교 조선해양공학부;

Keywords: Fatigue damage ratio, Fatigue strength, Tendon porch, Tension Leg Platform (TLP), S-N curves, Through-thickness crack

핵심용어: 피로손상률, 피로강도, 텐덤 포치, 인장식 해양구조물, S-N 곡선, 관통 균열

Abstract

This assessment is concerned with the fatigue strength of the tendon porch found in TLP. Lorge-scale fatigue tests with models constructed at 30% the size of the real structures have been carried out to investigate the fatigue behavior of the API 2W Grade 50 steel recently produced by POSCO. The fatigue life for the present test models was obtained based on the concept of nominal stress. A comparison of the present test results with those obtained by a numerical approach based on the structural analysis results has showngood agreement. The present results were also compared with the design curves in DnV RP-C203.