Dynamic response evaluations of dual cylindrical structure due to wave force

In this study, a coupled model is proposed to investigate dynamic response of a porous seabed and an offshore pile to ocean wave loadings. Both the offshore pile and the porous seabed are treated as a saturated poro-elastic medium, while the seawater is considered as a conventional acoustic medium. The coupled boundary element model is established by the continuity conditions along the interfaces between the three media. In the system, wave force is considered as an external load and it is evaluated via the wave function expansion method in the context of a linear wave theory. Numerical results show that the increase of the modulus ratio between the pile and the seabed can reduce the horizontal displacement of the pile and the pore pressures of the seabed around the pile. Furthermore, the maximum pore pressure of the seabed usually occurs at the upper part of the seabed around the pile.

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Analysis of wave force induced dynamic response of submerged floating tunnel

KSCE Journal of Civil Engineering ◽

10.1007/bf02899580 ◽

2004 ◽

Vol 8 (5) ◽

pp. 543-550 ◽

Cited By ~ 12

Author(s):

In Yeol Paik ◽

Chang Kook Oh ◽

Jang Sub Kwon ◽

Sung Pil Chang

Keyword(s):

Dynamic Response ◽

Wave Force ◽

Submerged Floating Tunnel

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Coupled dynamic response of a three-column mini TLP

Journal of Naval Architecture and Marine Engineering ◽

10.3329/jname.v6i2.2789 ◽

2010 ◽

Vol 6 (2) ◽

pp. 52-61 ◽

Cited By ~ 3

Author(s):

Anitha Joseph ◽

Lalu Mangal ◽

Precy Sara George

Keyword(s):

Finite Element ◽

Dynamic Response ◽

Wave Force ◽

Dynamic Responses ◽

Design Stage ◽

Force Model ◽

Diffraction Radiation ◽

Offshore Platforms ◽

Scaled Model ◽

Geometric Configurations

For the development of deepwater marginal fields, many new platform concepts and designs are on the anvil. The mini TLP is a proven concept in this regard wherein an optimised conventional TLP system economically and efficiently serves in developing small marginal deepwater reserves. Various new geometric configurations and designs of mini TLPs are reported in the literature. This paper presents a new geometric configuration which could be a better alternative to an existing configuration. A 3-column mini TLP is designed and its platform-mooring coupled dynamic behaviour is investigated and compared with an existing 4-column mini TLP. The numerical investigation is carried out for the 1:56 scaled model using a finite element computer program suitable for compliant offshore platforms. A combination wave force model with diffraction-radiation loading on large members and Morison loading on slender members is adopted for computing the non-linear dynamic response of the structure. The effects of parameters such as pretension in tethers and wave approach angle have been studied. The results obtained are compared with published results of the 4-column mini TLP. It is found that the dynamic responses of the 3-column mini TLP are close to the 4-column mini TLP with relatively higher surge and tether tension. Accounting for this in the design stage, the newly designed structure could be a promising candidate which can be used as an alternative to the 4-column mini TLP. Reducing the number of columns from four to three has added advantages in terms of cost and time during fabrication, installation and maintenance of the platform. Keywords: Deepwater structures; Coupled dynamics; Finite element method; Mini TLP; Nonlinear dynamicanalysis. DOI: 10.3329/jname.v6i2.2789

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