Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A Numerical Analysis for Stress Concentration of Openings in Offshore Tubular Steel Tower under Design Loading Condition

설계하중조건에 따른 해상풍력 강재타워 출입구에 발생되는 응력집중에 대한 해석적 연구

  • Reyno, Hannah (Department of Civil Engineering, Sangmyung University) ;
  • Park, Jong-Sup (Department of Civil Engineering, Sangmyung University) ;
  • Kang, Sung-Yong (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kang, Young-Jong (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 한나 (상명대학교 건설시스템공학과) ;
  • 박종섭 (상명대학교 건설시스템공학과) ;
  • 강성용 (고려대학교 건축사회환경공학부) ;
  • 강영종 (고려대학교 건축사회환경공학부)
  • Received : 2015.01.23
  • Accepted : 2015.02.12
  • Published : 2015.02.28
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Abstract

This study investigates the stress concentration factor of a door opening of an offshore tubular steel tower. The tubular steel tower is subjected to eight (8) different load combinations which are deemed to be normal and abnormal operating cases for the ultimate limit state and serviceability limit state. Analytical method using parametric equations and numerical method of finite element are used to analyze the stress components as well as any translations or rotations where the flow of stress is interfered with. A finite element program, ABAQUS, is used for the numerical method analysis. Trends of the stress concentration in the localized area near the opening are studied, and points of interest are defined for comparison among three different cases of tubular steel tower: without door and without reinforcement; without door opening and with reinforcement; and with door opening and with reinforcement. Findings are tabulated and shown in illustrative charts, and conclusions are made.

본 연구는 해상풍력 강재타워의 출입문에 발생되는 응력집중에 대해 상세히 기술하고 있다. 원형강재 풍력타워에는 8종류의 하중조합이 작용하며 그 하중조합은 극한한계상태와 사용한계상태를 고려한 정상 및 이상시 운영상태를 고려하고 있다. 유한요소해석 및 변수연구에 범용해석프로그램인 ABAQUS를 사용하였으며 응력값이 변화되는 곳을 고려하여 변위 및 응력을 검토하였다. 출입문 주변의 응력집중현상을 비교분석하기 위하여 출입문이 없는 경우, 출입문은 없으나 보강재가 있는 경우, 출입문 및 보강재가 모두 적용된 경우로 구분하여 해석연구를 수행하였다. 분석내용은 본문에 자세히 기술하고 있으며, 해석결과 응력집중계수 평균값은 1.47, 최대값은 1.81로 분석되었다.

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