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J. Ocean Eng. Technol. 2007;21(4):38-44.    

Effects of the Flexibility on the Structural Responses of a Tension Leg Platform
Lee Chang-Ho,Lee Soo-Lyong
Dept. of Naval Architecture Tongmyong University,Dept. of Naval Architecture Tongmyong University
인장계류식 해양구조물의 구조응답에 미치는 굽힘강성의 영향
이창호,이수룡
동명대학교 조선공학과,동명대학교 조선공학과
© 2007 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Tension leg platform, Three dimensional source distribution method, Hydrodynamic interaction, Structural damping, Structural analysis
핵심용어: 인장계류식 해양구조물, 3차원 특이점 분포법, 유체역학적 상호간섭, 구조감쇠, 구조해석
Abstract
The structural response characteristics of Tension leg platforms(TLPs) in waves are examined for presenting the basic data for structural design of TLPs. The numerical approach is based on a combination of the three dimensional source distribution method and the structural response analysis method, in which the superstructure of TLP is assumed to be flexible instead of rigid. Hydrodynamic and hydrostatic forces on the submerged surface of a TLP have been accurately calculated by excluding the assumption of the slender body theory. The hydrodynamic interactions among TLP members, such as columns and pontoons, and the structural damping are included in structural analysis. The mooring forces are estimated as the sum of pretension of tendons and variational tension due to longitudinal displacements. Stiffness matrices of elastic beam elements connecting nodes are formulated by ordinary method of three dimensional frame analysis. The equation of motion about the whole structure is obtained by the sum of forces and moments acting on each nodes.


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