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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.
중력식 항만구조물의 사석마운드 지반반력 평가식의 일반화
박우선(Woo-Sun Park) 한국해안해양공학회 2023 한국해안해양공학회 논문집 Vol.35 No.6
본 연구는 비정형 바닥판을 갖는 중력식 구조물의 사석마운드 지반반력을 대상으로 하였다. 구조물 바닥을 강체로 가정하고, 사석마운드는 압축에 대해서만 저항하는 바닥에 균일하게 분포하는 선형스프링으로 모형화하여 지반반력 산정식을 유도하였다. 바닥 형상이 사각형인 경우, 그 유도된 식이 설계에 사용되고 있는 식으로 변환됨을 보임으로써 유도 과정에 오류가 없음을 확인하였다. 또한, 비정형 바닥 형상이 사각형으로 수렴할 때의 지반반력의 거동과 그 수렴값을 살펴봄으로써 유도된 식의 타당성을 입증하였다. 실제 설계에서 사용되고 있는 방법의 적정성을 살펴보기 위하여 기 설계된 방파제 단면에 대한 단부 지반반력을 계산하고 설계서에 제시된 값과 비교하였다. 그 결과, 설계에 사용한 방법이 비안전측의 결과를 주었다는 것을 확인하였다. 특히, 극한 설계조건의 경우와 같이 연직하중의 편심이 큰 경우에 그 차이가 더 크게 나타났다. In this study, the bearing pressure on the rubble mound of a gravity-based harbor structure with an arbitrarily shaped bottom was targeted. Assuming that the bottom of the structure is a rigid body, the rubble mound was modeled as a linear spring uniformly distributed on the bottom that resists compression only, and the bearing pressure evaluation formula was derived. It was confirmed that there were no errors in the derivation process by showing that when the bottom was square, the derived equation was converted to the equation used in the design. In addition, the validity of the derived equation was proven by examining the behavior and convergence value of the bearing pressure when an arbitrarily shaped bottom converges into a square one. In order to examine the adequacy of the method used in the current design, the end bearing pressure for the pre-designed breakwater cross-section was calculated and compared with the values in the design document. As a result, it was shown that the method used for design was not appropriate as it gave unsafe results. In particular, the difference was larger when the eccentricity of the vertical load was large, such as in the case of extreme design conditions.