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Research on the Hydrodynamic Performance and Structural Strength of Truss Spar during the Load-out, Transportation and Float-off Processes

Author: Yang
Tutor: YangJianMin
School: Shanghai Jiaotong University
Course: Naval Architecture and Ocean Engineering
Keywords: Truss Spar Structure Strength Analysis Wave loads Load-out Transportation Float-off
CLC: U674.381
Type: Master's thesis
Year: 2012
Downloads: 101
Quote: 0
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Abstract


With the development of petroleum resources in deep-sea, the demand of the new type deep-sea platform is increasing. Truss Spar platform has become one of the most popular deep-sea platforms with its excellent performance and relatively low cost. The existence of the truss members leads to the particularity construction of Truss Spar platform. Rigidity of structure section, as well as the buoyancy and weight distribution are uneven along the length. This makes it a large difference with other platforms from its load-out to offloading. This paper systematically discusses the structural strength and hydrodynamic performance during the load-out, dry tow, float-off and wet tow operations.This thesis mainly consists of two parts.First of all, the structural finite element model of the Truss Spar and its cradles are established, in order to engage strength analysis during the load-out process. According to the elastic-plastic deformation theory, the envelope curves of the cradle vertical forces, the global stress level of the Spar platform and the limit load curve are obtained to be the control condition for the adjustment of barge ballast, and to be the security of the Spar platform structure.Based on the three-dimensional flow theory, the hydrodynamic analysis of the barge dry tow Spar system is carried out. Engage a long-term analysis of the wave induced load and system motion response. The wave loads are solved by using design wave method and the structure strength calculation of wave induced global bending and twisting is done. The structure strength and deformation of the barge dry tow Spar system in the design wave is obtained. According to the stress level of the key components, the feasibility of Spar platform fastening is estimated.The hydrodynamic analysis and the global strength analysis of the Spar during wet tow process are carried out with the consideration of environmental forces and towing force. The motion performance of the Spar is assessed. The structure strength and deformation are discussed.Structural analysis of the multi-body stage during the float-off operation for a Truss Spar is proposed. Considering the interactions between the two floating bodies, the wave loads in frequency domain and the contact forces in time domain are investigated. The stress results of the Spar components are obtained with the combination of the structural analysis results under wave loads and contact forces application based on the linear superposition method. Contact forces under different wave directions and periods are discussed. The global stress level and high stress area of the Spar components can be obtained to assess the float-off strength condition of the Spar platform.

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CLC: > Transportation > Waterway transport > Marine Engineering > Various types of vessels > Engineering Ship > Marine development of boat > Rigs, drilling platforms
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