Publication Date: Sat Dec 31 00:00: OSTI Identifier: 433639 Report Number(s): CONF-940409- ISBN 1-88 TRN: IM9709%%72 Resource Type: Conference Resource Relation: Conference: 4. international conference on offshore and polar engineering, Osaka (Japan), 10- Other Information: PBD: 1994 Related Information: Is Part Of The proceedings of the fourth (1994) international offshore and polar engineering conference. The paper further describes the post-processing of the results from the finite element analysis.Ĭountry of Publication: United States Language: English Subject: 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES NORTH SEA OFFSHORE PLATFORMS COMPUTER-AIDED DESIGN SAFETY ANALYSIS SEISMIC EFFECTS RESPONSE FUNCTIONS WAVE FORCES DYNAMIC =, Volume 4 Ueda, Yukio Tomita, Yasumitsu Dos Santos, J.F. This includes the accuracy of integration of stresses to obtain force resultants as basis for the general design, the accuracy of extrapolation of force resultants to critical cross-sections and the limitations in the code checking in general. Offshore concrete structures are today designed using the best available techniques. These include predictions of the force resultants in the structure using FE analysis with up to 1.5 million degrees of freedom, code checking of FE results using special dedicated postprocessing software, local capacity evaluations in areas where the linear FE analysis is known to be inaccurate. Cynthia Pikaar, sales manager for C-Kore Systems, said: Our equipment saves customers a lot of time on their subsea testing operations, allowing them to reduce the operation’s overall CO 2 carbon-dioxide footprint. Further, special analyses are carried out for prediction of response from earthquake, wave induced dynamic action and geometric non-linear action. By testing directly onto the subsea equipment, the need for platform-led testing or down-lines is said to be eliminated. Equinor and five oil and gas partner companies in Norway have received government approval for their plan to power the Draugen and Njord A offshore platforms with electricity from shore. This paper addresses the finite element modeling of a large offshore structure for verification purposes, based upon the experience gained with the Draugen more » GBS platform for A/S Norske Shell. The paper describes the philosophy for element selection, fineness in model, incorporation of built in stresses through the construction phases and the different load cases applied on the model. The Design Contractor's finite element approach, with automatic post processing and the optimized design, triggered the need to carry out independent checks of the accuracy of the design analysis.The paper further describes the post-processing of the results form the finite element analysis. In addition, waterflood is already used very effectively. The Draugen reservoir is very homogeneous, which facilitates recovery. BACKGROUND The DRAUGEN GBS platform (See fig 1) had been designed and constructed by the same company who designed the SLEIPNER A GBS This means an optimal structural design, using automatic design approaches to the extent possible. : OKEA has selected Aker Solutions as the main contractor for Engineering, Procurement, Construction, and Installation (EPCI). The expected recovery on Draugen is already 66, a comparatively high proportion. The paper will not go into details on direct findings from the verification work, but will present findings and experience which may have general interest for future platform designs. In this paper, the authors will explain the approach used m the verification work, and discuss advantages and disadvantages in this approach. Following the sudden failure of the SLEIPNER A GBS platform on August 23 1991, VERITEC was requested by A/S NORSKE SHELL to carry out an independent verification of the DRAUGEN GBS platform VERITEC was given freedom to select the approach to increase confidence in the given design.
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