Spectral Analysis of Offshore Structures Under Wave and Earthquake Loadings

Karadeniz, H.; Saka, M.P.; Toğan, Vedat

doi:10.1007/978-1-84996-190-5_4

Cited by 6 publications

(5 citation statements)

References 73 publications

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“…Therefore, it is necessary to investigate the dynamic response of platforms under the combined action of both earthquake and waves. Studies on the dynamic response of offshore platforms subjected to wave and seismic actions have been reported by some investigators (Isaacson and Songren, 1984;Kokkinowrachos and Thanos, 1990;Bea and Young, 1993;Venkataramana and Kawano, 1995;Venkataramana et al, 1998;Karadeniz, 1999;Fukusumi et al, 2003;Etemad et al, 2004;He and Li, 2007a, b). In these studies, a simplifi ed story model or detailed and complex fi nite element model was used for both elastic and inelastic response analyses.…”

Section: Introductionmentioning

confidence: 94%

Torsionally coupled dynamic performance analysis of asymmetric offshore platforms subjected to wave and earthquake loadings

2010

Earthq. Eng. Eng. Vib.

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The dynamic equations of motion of asymmetric offshore platforms under three different environmental conditions: seismic action, wave action and their combination are established in this paper. In establishing these motion equations, three typical eccentricity types including mass eccentricity, rigidity eccentricity and their combination were considered, as are eccentricities that occur uni-directionally and bi-directionally. The effects of the eccentricity type, the dynamic characteristics and the environmental conditions on the torsional coupling response of platforms are investigated and compared. An effort has also been made to analyze the infl uence of accidental eccentricity on asymmetric platforms with different eccentricity in two horizontally orthogonal directions. The results are given in terms of non-dimensional parameters, accounting for the uncoupled torsional to lateral frequency ratio. Numerical results reveal that the eccentricity type has a great infl uence on the torsionally coupled response under different environmental conditions. Therefore, it is necessary to consider the combination of earthquake and wave action in the seismic response analysis of some offshore platforms.

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Section: Introductionmentioning

confidence: 94%

Torsionally coupled dynamic performance analysis of asymmetric offshore platforms subjected to wave and earthquake loadings

2010

Earthq. Eng. Eng. Vib.

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“…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%

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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“…Several analyzes have been carried out in previous studies about coupling hydrodynamic force with other phenomena such as: earthquake, wind, corrosion, scouring, tide level and etc. (Karadeniz 1999;Watanabe and Tomoaki 2003;Eicher, Guan, and Jeng 2003;De-gui et al 2008;F. Li et al 2008;Song 2010;S.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of a Coupled High-Speed Train and Bridge System Subjected to Sea Wave Hydrodynamic Load

Kalajahi

Esmaeili

Zakeri

2021

Lat. Am. j. solids struct.

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In this study, the dynamic behavior of the 3D train-bridge system subjected to different hydrodynamic loads (TBW model) is established. By taking a continuous bridge with box girders as a case study, the dynamic responses of the bridge which is under train passing and subjected to several sea hydrodynamic loads are analyzed. Hydrodynamic forces are applied on piers according to Morison's theory and car body is modeled by a 27-DoFs dynamic system. Model validation has been performed with other research by considering vessel collision load. In continuation, the dynamic responses of the bridge and the running safety indices of the train on the bridge under several conditions are analyzed. Consequently an assessment procedure is proposed for the running safety of high-speed trains on bridges subjected to wave loads. Results of TBW's sensitive analyzes have shown the importance of sea-states conditions for train safe and comfortable running. These outputs indicates that in stormy conditions, the speed of the train crossing the bridges should be reduced and it is possible for the train to pass at low speeds in stormy conditions.

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Spectral Analysis of Offshore Structures Under Wave and Earthquake Loadings

Cited by 6 publications

References 73 publications

Torsionally coupled dynamic performance analysis of asymmetric offshore platforms subjected to wave and earthquake loadings

Torsionally coupled dynamic performance analysis of asymmetric offshore platforms subjected to wave and earthquake loadings

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

Dynamic Analysis of a Coupled High-Speed Train and Bridge System Subjected to Sea Wave Hydrodynamic Load

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