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대규모 폭풍에 대한 Tension Leg Platform의 신뢰도해석
朴佑善(Woo-Sun Park),尹禎邦(Chung-Bang Yun) 한국해양공학회 1991 韓國海洋工學會誌 Vol.5 No.1
This paper presents a method of the reliability analysis for a tension leg platform(TLP) in severe storm waves by using the first passage concept of the random tensile stress in the tendons. In the present method, two failure conditions are considered ; i. e., the excee-dance of the ultimate tensile capacity and the occurrence of the negative tension. In order to consider the correlation effects between the failure events for each corner resulted from the rupture of all tendons at one corner, a new system limit state for a rectangular shaped TLP is developed, which is defined in terms of the TLP motions in the vertical plane ; i. e., heave, roll, and pitch. To illustrate the validity of the present method, the numerical analysis is carried out for two TLP's with different structural dimensions. Then, the results are compared with those by other methods.
박우선(Park, Woo-Sun),편종근(Pyun, Chong-Kun),박영석(Park, Young-Suk) 한국해안해양공학회 1991 한국해안해양공학회 논문집 Vol.3 No.3
본 논문에서는 파랑하중을 받는 Guyed Tower의 비선형 동적거동에 대하여 연구하였다. Guyed Tower를 효율적으로 해석하기 위하여 Tower는 등가의 기둥으로 모형화 하였으며, 계유장치는 수평방향의 비선형 경계요소로 이상화하였다. 또한 파일 기초부는 회전방향의 선형경계요소로 대치하였다. Tower에 작용하는 파랑하중은 Morison 방정식에 의한 산정하였다. 계유장치와 유체의 점성에 기인된 항력 등의 비선형성을 적절히 고려하기 위하여 시간영역에서 해석을 수행하였으며, 비선형 운동방정식을 효율적으로 풀기 위해 Newmark 적분기법에 기초한 모우드 중첩법을 사용하였다. Guyed Tower의 중요한 설계변수인 계유선의 Clump weight 중량 조건과 파일 기초부 조건의 변화에 대한 수치해석을 수행하였다. This study is concerned with the nonlinear dynamic behaviors of guyed towers for wave loadings. In order to analyze the nonlinear responses of guyed towers efficiently, the main tower is modeled as an equivalent stick, the guyline system is idealized as a spring with nonlinear stiffness in the horizontal direction. and the pile foundation system is represented as a linear spring in the rotational direction. The wave forces on the main tower are evaluated by using Morison's equation. In order to consider adequately the nonlinearities of the guying system and drag forces due to fluid viscosity. the analyses are performed in the time domain. The mode superposition method is adopted for solving the nonlinear equation of motion efficiently. which is based on the Newmark integration scheme. Numerical analyses are carried out to investigate the sensitivity of two major design parameters for guyed towers. i.e., the clump weight conditions and the base renditions of the tower.