Fullscale.docx

Abstract Analysis of full-scale measurements obtained from the instrumented Smedvig West Epsilon jack-up platform operating in the STATOIL Sleipner Vest eld in the North Sea is described. This jack-up platform has a skirted spud-can foundation. The following topics are discussed in the paper:i Comparison between measured and calculated natural frequencies and modes of the plat- form based on modal analysis.i Comparison of measured foundation sti!ness with the design sti!ness.i Comparison between measured and simulated platform response by application of a nonlin- ear time domain analysis. Implications with respect to procedures and assumptions em-ployed for design of the platform are addressed.The comparison between measured and simulated response is performed for a moderate sea state with a signicant wave height of 9.3 m. ?? 1999 Elsevier Science Ltd. All rights reserved.描述了从在北海的STATOIL Sleipner Vest字段中操作的仪表化的Smedvig西Epsilon自升式平台获得的全尺寸测量的分析，该自升式平台具有裙状定位桩基座。 在论文中：i基于模态分析的测量和计算的固有频率和平台模式之间的比较。i测量的基础刚度与设计结构的比较。i通过应用非线性时域分析来测量和模拟平台响应之间的比较。 在程序和假设方面的影响，致力于平台的设计。测量的和模拟的响应之间的比较是在适度的海洋状态下进行的，具有显着的波峰高度为9.3m。1999 Elsevier Science Ltd.保留所有权利。IntroductionSignicant experience with design and operation of jack-up platforms has been accumulated over the years. However, the reliability level which are implied by existing design procedures with respect to hydrodynamic loading still needs to be assessed carefully.Di!erent design codes apply di!erent criteria for selection of hydrodynamic coe$cients,choiceofdesignwaveheightandperiod,choiceofdesigncurrent,andpartlyfor modeling of water particle kinematics. Thevalidityof existing loadmodelsis accordinglyan issue of continuousrelevance, particularly for extreme load events. Direct measurement of the hydrodynamic load itself is not feasible or even possible. Generally, measurement of the sea surface elevationis performed in addition to structural response (strains and accelerations)at selected locations. Assessment of load intensity is s