Dynamic response analysis of an offshore platform due to seismic motions

Park, Minsu; Koo, Weoncheol; Kawano, Kenji

doi:10.1016/j.engstruct.2011.01.030

Cited by 32 publications

(14 citation statements)

References 15 publications

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“…The results obtained were compared with those obtained using the finite element method, which is proved to be an accurate method (Bargi et al 2011;Park et al 2011). The finite element model (using software ANSYS) for a typical comprehensive sixlegged jacket platform is shown in Figure 2.…”

Section: Example Application and Discussionmentioning

confidence: 99%

“…Many studies in the numerical analysis (Xiao 1997;Wilson 2000;Kim et al 2005;Han 2008;Zhou et al 2010Zhou et al , 2013aZhou et al , 2013bPark et al 2011;Ren and Bai 2013) have been performed with the view that the use of more sophisticated computational model could obtain the highly accurate results. Typically due to the low accuracy and efficiency of the simulation, the target often may not be realised.…”

Section: Simplified Modelling Methodsmentioning

confidence: 98%

“…The analysis of offshore structures such as offshore towers and jacket platforms subject to ground motions has been carried out using stochastic method Kaul 1972 andTseng 1978), spectral analysis (Karadenia 1999;Han et al 2006 and2008;Chandrasekaran and Nannaware 2014), modal analysis and substructure methods (Park et al 2011). The seismic loadings are usually asymmetric (He and Li 2010) and non-linear (Bargi et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Random seismic response analysis of jacket structure with Timoshenko's beam theory

Zhou

Guo

Han

et al. 2015

Ships and Offshore Structures

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Soon-keat Tan (2015): Random seismic response analysis of jacket structure with Timoshenko's beam theory, Ships and Offshore Structures, Today many complex three-dimensional (3D) models, typically finite element method (FEM) models, have been used in the analysis of jacket platforms. However, these comprehensive models are not readily adopted in engineering practice, especially during the preliminary design stage. The main reasons are the large computing resources required and the lack of detailed information for setting up the FEM model. In this paper, a simplified response analysis method is proposed to make preliminary estimate of the random seismic responses on jacket platforms. Based on Timoshenko's beam theory, the equation of bending motion was proposed and solved by using the classical Ritz method combined with the pseudo-excitation method. A computer code for computing random seismic responses was also developed and verified. A six-legged jacket platform was used as an example, whereby three types of Ritz functions were used to illustrate the validity of the model. The results of this study were compared with those obtained from a well-established complex 3D FEM model. The findings of the comparison showed that the accuracy of the simplified model was better than 95%. It was concluded that the proposed simplified method was effective, useful and practical in seismic design of platforms.

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Section: Example Application and Discussionmentioning

confidence: 99%

Section: Simplified Modelling Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Random seismic response analysis of jacket structure with Timoshenko's beam theory

Zhou

Guo

Han

et al. 2015

Ships and Offshore Structures

View full text Add to dashboard Cite

show abstract

“…The investigations about probabilistic seismic performance and dynamic reliability estimation, paying special attention to damaged structures [15] and stochastic structures [16,17], have been conducted for bridges [18][19][20][21], frames [22][23][24], offshore structures [25], underground structures [26] and towers [27] under stationary or non-stationary random excitations in recent years, with a great effort for the computational efficiency [28][29][30]. Nevertheless, even allowing for such various engineering applications, it would appear that so far no dynamic reliability analysis has taken note of the realistic longterm effect occurring anterior to the random excitations, in spite that concrete is aging viscoelastic in nature and the time-dependent property exerts a considerable influence on structural behaviours in practice as stated above.…”

Section: Introductionmentioning

confidence: 99%

Creep influence on structural dynamic reliability

Wang

2015

Engineering Structures

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“…An impedance function was used for analysis of the suction bucket-soil foundation system. Impedance coefficients as damping and stiffness matrices were applied to the equation of motion for the foundation system [7,8].…”

Section: Formulationmentioning

confidence: 99%

Numerical Analysis of a Gravity Substructure for 5 MW Offshore Wind Turbines Due to Soil Conditions

Park¹,

Jeong²,

You³

2016

JEPE

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Abstract:In order to increase the gross generation of wind turbines, the size of a tower and a rotor-nacelle becomes larger. In other words, the substructure for offshore wind turbines is strongly influenced by the effect of wave forces as the size of substructure increases. In addition, since a large offshore wind turbine has a heavy dead load, the reaction forces on the substructure become severe, thus very firm foundations should be required. Therefore, the dynamic soil-structure interaction has to be fully considered and the wave forces acting on substructure accurately calculated. In the present study, ANSYS AQWA is used to evaluate the wave forces. Moreover, the substructure method is applied to evaluate the effect of soil-structure interaction. Using the wave forces and the stiffness and damping matrices obtained from this study, the structural analysis of the gravity substructure is carried out through ANSYS mechanical. The structural behaviors of the strength and deformation are evaluated to investigate an ultimate structural safety and serviceability of gravity substructure for various soil conditions. Also, the modal analysis is carried out to investigate the resonance between the wind turbine and the gravity substructure.

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Dynamic response analysis of an offshore platform due to seismic motions

Cited by 32 publications

References 15 publications

Random seismic response analysis of jacket structure with Timoshenko's beam theory

Random seismic response analysis of jacket structure with Timoshenko's beam theory

Creep influence on structural dynamic reliability

Numerical Analysis of a Gravity Substructure for 5 MW Offshore Wind Turbines Due to Soil Conditions

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