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Collaborating Authors
Results
Uncertainty Effects On Performance Based Evaluation of Offshore Platform Due to Dynamic Forces
Kawano, Kenji (Department of ocean civil engineering, Kagoshima University Kagoshima, Japan) | Kimura, Yukinobu (Department of ocean civil engineering, Kagoshima University Kagoshima, Japan) | Min-Su, Park (Department of ocean civil engineering, Kagoshima University Kagoshima, Japan) | Iida, Takeshi (Department of civil engineering, Osakasangyou University Osaka, Japan)
ABSTRACT The performance based evaluation of an idealized three dimensional model of the offshore platform subjected to wave and seismic force is carried out using the MCS (Monte Carlo Simulation) approach in the present study. It is known that application of the reliability approach is very effective to estimate the response evaluation to not only the static forces but also the dynamic forces with uncertain situations. It is suggested that the reliability index determined by the MCS method to dynamic forces with considerably different characteristics plays the important roles on the available estimation of the performance based design on the offshore structure. INTRODUCTION It is supposed that the reliable design of the offshore structure could be performed with the performance based evaluation. The dynamic forces such as the wave and seismic force include some uncertainties and it is important to examine the uncertainty effects on the dynamic response evaluation. Performing the elaborate evaluation of the dynamic response of the offshore structure, it is necessary to verify the uncertainty effects due to severe dynamic forces on the linear response situation as well as the nonlinear one. Many researches have been implemented to estimate the uncertainty effects on the design of the structure, especially to the land structure. Furthermore, it is suggested that the damage estimation plays important roles on the performance based evaluation with respect to dynamic forces. There are several available methods on the damage evaluations of the structure subjected to seismic motions (Fajfar, P, 1992, Park and Ang,1985). The strength demand spectrum is one of the most useful methods which can be treated with nonlinear effects on the structure subjected to seismic motions (Iemura,1998). It is supposed that the available damage evaluation could not be always carried outonly the strength demand response spectrum.
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (0.94)
- Reservoir Description and Dynamics > Reservoir Simulation (0.66)
- Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems (0.62)
Response Evaluations of an Offshore Structure Foundation System to Wave And Seismic Forces With Uncertainties
Kawano, Kenji (Department of civil engineering, Kagoshima University) | Kimura, Yukinobu (Department of civil engineering, Kagoshima University) | Iida, Takeshi (Department of civil engineering, Osakasangyou University)
ABSTRACT In order to enhance the reliability of the offshore platform foundation subjected to wave and seismic forces, it is very important to clarify the dynamic response properties due to these forces with uncertainties. In the present study, the MCS (Monte Carlo Simulation) approach is applied to evaluate the uncertainty effects on the maximum response quantities of an idealized 3-dimensional offshore platform with foundation. The MCS method can be efficiently applied to the response evaluations of the offshore platform with pile foundation system with uncertainties. It is shown that since the uncertain parameters play important contributions on the maximum response evaluations, it is essential to estimate the effects on uncertainties to responses for the reliable design of the offshore platform with foundation. INTRODUCTION For the offshore structure subjected to dynamic forces, the dynamic response is usually carried out with the time domain analysis and spectrum analysis. While the most important dynamic force is given by the wave force, it is essential to clarify the combined contribution on the seismic force for the offshore structure located in seismic active area. An effective method should be provided by the random vibration approach on the response evaluations of the offshore structure subjected to dynamic forces with random properties. It is shown that the characteristics of the structure and external forces have usually uncertainties on the response evaluations. In order to implement the reliable design of the offshore structure, it is important to clarify the effects on the uncertainties to the maximum response estimation. If the response estimation to uncertainties of the external forces are represented with the random vibration approach, it is suggested that the second moment approach can provide an effective method for the response evaluation (Kawano et al(2001)).
- Asia > Japan (0.28)
- North America > United States > California (0.28)
- Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems (0.98)
- Reservoir Description and Dynamics > Reservoir Simulation > Evaluation of uncertainties (0.46)
MCS Evaluations On Dynamic Responses of an Offshore Structure With Uncertainties
Kawano, Kenji (Department of civil engineering, Kagoshima University) | Kimura, Yukinobu (Department of civil engineering, Kagoshima University, 1-21-40 Korimoto) | Kukusako, Hisasi (Department of civil engineering, Kagoshima University) | Iida, Takesi (Department of civil engineering, Osaka Sangyo University)
ABSTRACT For an offshore structure subjected to severe wave forces, it is very important to make the dynamic response characteristics clearly for the reliable design of the structures. The random vibration approach gives very effective methods on the dynamic response evaluations for the offshore structure subjected to the forces. The characteristics of the structure and external forces have generally uncertainties on the response evaluations. It is very important for the reliability assessment to evaluate the uncertain parameter effects on the maximum response quantities. The Monte Carlo simulation (MCS) comes to an effective method on the evaluations of these uncertainties. The MCS approach in nonlinear situation is applied to evaluate the uncertainty effects on the offshore structure in the present study. The dynamic response properties of the offshore platform subjected to severe wave forces are examined by the MCS. The governing equation of motion is formulated with the finite element method for an idealized 3-dimensional offshore structure. Considering uncertain parameters in the strength of materials of the structure and the dynamic wave forces, it is very essential to clarify these uncertain parameters contributions on the responses with respect to the reliability evaluations of the offshore structure. It is shown that the MCS method with respect to nonlinear situations surely comes to very effective method to the uncertain parameter effects on the response evaluations for the offshore structure. Since the uncertain parameters give the important contributions on the maximum response evaluations, it is essential for the reliable design of the offshore structure to make the uncertainty effects clearly with respect to the response. INTRODUCTION Since the uncertainties with the dynamic forces play significant roles on the response evaluations of the structure, it is essential for reliable design of the structure to perform the dynamic response evaluations to the forces.
- Reservoir Description and Dynamics > Reservoir Simulation (0.48)
- Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems (0.34)