Describes a study that focused on addressing the conceptual issues related to classifying and analyzing uncertainties in loads on offshore structures, and on developing a sound and practical methodology for uncertainty analysis. Uncertainties are classified with respect to source: basic uncertainty regarding physical parameters affecting the design load, model uncertainty regarding the calculations used to estimate physical parameters, and distribution uncertainty regarding probability distributions used to model random quantities. A generalized load model that incorporates all uncertainties is described and applied to wave loads on the Hibernia offshore structure. Effects of individual and combined uncertainties on calculated design loads are analyzed and the implications for design code development are discussed.

Describes a study conducted to further develop and test a previously developed methodology for characterization and modelling of uncertainties in the determination of loads on offshore structures. Tasks carried out in the study include a finalization of the methodology; an investigation of the sensitivity of the 100-year load effect with respect to the distribution types used to model uncertain parameters, the degree of non-linearity of the load effect model, and the probabilistic characterization of model uncertainty as fixed or variable in time; and development of design load factors leading to a specified target reliability level for a range of parameters. On the basis of the results, recommendations are developed regarding design code implementation for offshore structures.

Successfully estimate risk and reliability, and produce innovative, yet reliable designs using the approaches outlined in Offshore Structural Engineering: Reliability and Risk Assessment. A hands-on guide for practicing professionals, this book covers the reliability of offshore structures with an emphasis on the safety and reliability of offshore facilities during analysis, design, inspection, and planning. Since risk assessment and reliability estimates are often based on probability, the author utilizes concepts of probability and statistical analysis to address the risks and uncertainties involved in design. He explains the concepts with clear illustrations and tutorials, provides a chapter on probability theory, and covers various stages of the process that include data collection, analysis, design and construction, and commissioning. In addition, the author discusses advances in geometric structural forms for deep-water oil exploration, the rational treatment of uncertainties in structural engineering, and the safety and serviceability of civil engineering and other offshore structures. An invaluable guide to innovative and reliable structural design, this book: Defines the structural reliability theory Explains the reliability analysis of structures Examines the reliability of offshore structures Describes the probabilistic distribution for important loading variables Includes methods of reliability analysis Addresses risk assessment and more Offshore Structural Engineering: Reliability and Risk Assessment provides an in-depth analysis of risk analysis and assessment and highlights important aspects of offshore structural reliability. The book serves as a practical reference to engineers and students involved in naval architecture, ocean engineering, civil/structural, and petroleum engineering.