Numerical Analysis of the Dynamic Response of an Offshore Platform with a Pile-Soil Foundation System Subjected to Random Waves and Currents

2012 ◽  
Vol 138 (4) ◽  
pp. 275-285 ◽  
Author(s):  
Min-Su Park ◽  
Weoncheol Koo ◽  
Kenji Kawano
Keyword(s):  
Numerical Analysis ◽  
Dynamic Response ◽  
Offshore Platform ◽  
Random Waves ◽  
Waves And Currents ◽  
Soil Foundation

Reliability Evaluations of an Offshore Platform With Pile-Soil Foundation System Due to Random Wave and Seismic Forces

2010 ◽  
Author(s):  
Minsu Park ◽  
Kenji Kawano ◽  
Yoonrak Choi ◽  
Weoncheol Koo
Keyword(s):  
Dynamic Response ◽  
Soil Structure ◽  
Offshore Platform ◽  
Soil Structure Interaction ◽  
Random Wave ◽  
Structure Interaction ◽  
Dynamic Forces ◽  
Soil Foundation ◽  
Reliable Design ◽  
Seismic Forces

It has been well recognized the importance of dynamic soil-structure interaction for several structures founded on soft soils. In order to examine the effects of soil-structure interaction, the substructure method is applied to the dynamic response evaluations of offshore platform. Since the offshore platform is generally subjected to severe dynamic forces such as wave, current and seismic forces, it is very important to clarify the dynamic response characteristics for the reliable design of the platform. For the idealized three-dimensional offshore platform subjected to random waves and seismic forces with the pile-soil foundation system, the dynamic response evaluations were carried out through the modal analysis. On the other hand, the uncertainty effects of dynamic forces and structural properties play very important roles on the reliability evaluations of offshore platform. If the limit state function is given by the most critical situations of dynamic responses, the reliability evaluations of the platform can be effectively calculated by the reliability index with the results obtained from Monte Carlo Simulation (MCS) method. Since the uncertainty of the random wave and seismic forces is critical for dynamic response evaluations, it is necessary to clarify the effects of uncertainties for the reliable design of the offshore platform.

Fatigue Analysis of a Jacket Structure to Linear and Weakly Nonlinear Random Waves

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Naser Shabakhty ◽  
Arash Khansari
Keyword(s):  
Dynamic Response ◽  
Engineering Practice ◽  
Linear Wave ◽  
Fe Model ◽  
Random Waves ◽  
Weakly Nonlinear ◽  
Analysis And Design ◽  
Jacket Structures ◽  
Wave Models ◽  
Nonlinear Random Waves

Jacket structures have been widely used in oil and gas industry and are increasingly becoming competitive as a support structure of wind turbines at different water depths. These types of structures usually fix in transition or shallow waters where numerous field observations and experiments have shown that water particles tend to exhibit non-Gaussian characteristics. However, current engineering practice ignores the wave nonlinearity for the analysis and design of these structures. The application of linear irregular models might result in considerable uncertainties in the obtained wave loads and consequently the dynamic response and thus it is highly questionable. Therefore, it is crucial to calculate the dynamic response of jacket structures under both linear and nonlinear wave models to investigate the validity of linear wave models in different sea states. In this paper, the finite element (FE) model of a jacket structure located in Persian Gulf (SP17 jacket) is setup and applied to perform a comparative study of the dynamic response to both linear and weakly nonlinear random waves. The fatigue life of the jacket structure is then calculated under both wave models. This paper will substantially improve the understanding of the dynamic response of jacket structures under fatigue damage.

Numerical Analysis of Dynamic Response of Lifelines Facilities Adjacent to Deep Excavations

2020 ◽  
Author(s):  
Seddigheh Hasanpour Estahbanati ◽  
Reza Boushehri ◽  
Abbas Soroush ◽  
Omid Ghasemi-Fare
Keyword(s):  
Numerical Analysis ◽  
Dynamic Response ◽  
Deep Excavations

The Numerical Analysis of CFG Pile Technology in the Disposing Soft Foundation in GuangWu Expressway

2011 ◽  
Vol 90-93 ◽  
pp. 2096-2100
Author(s):  
Yun Mei Meng ◽  
Yun Cao
Keyword(s):  
Numerical Analysis ◽  
Soft Soil ◽  
Influence Factors ◽  
Computational Results ◽  
Soft Foundation ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Cfg Pile

The problem of disposing the soft soil foundation will appear inevitably during the construction of modem high way. There are many ways to dispose the soft foundation. One of those is CFG pile technology. Take the CFG pile technology in the GuangWu Expressway for example, the influence factors of embankment settlement were discussed in detai by numerical analysis, some useful conclusions are obtained from the computational results.

Experimental and Numerical Study on Dynamic Response of FSRU-LNGC Side-by-Side Mooring System

2019 ◽  
Author(s):  
Jingxia Yue ◽  
Weili Kang ◽  
Wengang Mao ◽  
Pengfei Chen ◽  
Xi Wang
Keyword(s):  
Numerical Analysis ◽  
Dynamic Response ◽  
Numerical Study ◽  
Clean Energy ◽  
Coupled Analysis ◽  
Response Analysis ◽  
Mooring System ◽  
Test Results ◽  
Floating Bodies ◽  
Damping Parameter

Abstract Floating Storage and Regasification Unit (FSRU) becomes one of the most popular equipment in the industry for providing clean energy due to its technical, economic and environmental features. Under the combined loads from wind, wave and current, it is difficult for the prediction of the dynamic response for such FSRU-LNGC (Liquified Natural Gas Carrier) side-by-side mooring system, because of the complicated hydrodynamic interaction between the two floating bodies. In this paper, a non-dimensional damping parameter of the two floating bodies is obtained from a scaled model test. Then the numerical analysis is carried out based on the test results, and the damping lid method is applied to simulate the hydrodynamic interference between floating bodies. The dynamic response of the side-by-side mooring system including six degrees of freedom motion, cable tension and fender force are provided and analyzed. According to the comparisons between numerical results and the test results, it is shown that the proposed coupled analysis model is reliable, and the numerical analysis can properly describe the dynamic response of the multi-floating mooring system in the marine environment. Moreover, the non-dimensional damping parameter which is used in numerical analysis can act as a good reference to the dynamic response analysis of similar multi-floating mooring systems.

Statistical Analysis of In-Line Interaction of Closely Spaced Cylinder Arrays in Random Waves

2020 ◽  
Author(s):  
Jiangnan Lu ◽  
J. M. Niedzwecki
Keyword(s):  
Goodness Of Fit ◽  
Slenderness Ratio ◽  
Steel Wire ◽  
Relative Displacement ◽  
Plastic Shell ◽  
Random Waves ◽  
Response Behavior ◽  
Cylinder Arrays ◽  
Waves And Currents ◽  
Anderson Darling

Abstract Closely spaced cylinder arrays are widely used in offshore platform designs. When subject to random waves and currents, their interactive response behavior is very complicated and perhaps beyond the ability of direct analytical formulations to model their motions. In this study extremal statistics methods were utilized to analyze model basin data that investigated the response behavior of in-line paired and triple deep-water cylinder arrays. The cylinder models used in the model basin experiments were constructed with an ABS outer plastic shell that surrounded an inner steel wire core that could be pretensioned. The cylinder model diameter ratio of the outer shell to steel wire was 4.25 with a slenderness ratio of approximately 1300. The cylinder arrays were pretensioned on the top side and were tested varying pitch to diameter ratios of 3.0, 4.4, and 8.75. The random sea states were simulated using a JONSWAP spectrum. The response time series were investigated using generalized extreme value (GEV) distributions that were fitted to the block maxima that represented the maximum in-line relative displacement between two adjacent tendons. The most appropriate models were selected by comparing their goodness of fit via the Anderson-Darling (AD) test criterion with special attentions paid to their performance in fitting the upper tail of the distribution. The selected models were then used to predict threshold-crossing probabilities of the cylinder array relative response behavior. Both tabular and graphical interpretations of the findings are presented and discussed.

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