Guidance on Structural Reliability Analysis of Marine Structures
Year: 2003 Language: english Author: Professor P.K. Das Genre: Lectures Format: PDF Quality: eBook Pages count: 181 Description: Chapter 1 reviews the structural reliability design process and presents the general procedure of structural reliability analysis. An overview of uncertainties and failure modes is given, including objective uncertainties and subjective uncertainties. A detailed description of the associated reliability concepts, definitions and notations is given. Finally, the benefits and drawbacks of using probability-based design methods are listed and the role of reliability analysis in a general probability design procedure is represented. In chapter 2, the basic theories and methods of reliability are presented in detail. Analytical methods (approximate methods) are introduced. The direct integration method is presented, including the techniques of standardized integral region, joint probability density function, multivariate integration and advanced method of integration. Monte Carlo simulation methods and response surface methods are presented, including basic theory, with simplifications for large systems, iterative solution scheme and response surface and finite analysis etc. Suggestions are given for choosing reliability methods. In chapter 3, the general procedure for modelling of a physical problem in a probability manner is presented, with guidance on identification of the problem. Then, to ensure the safety of the designed structure, all significant modes of failure for the structure are identified. The sensitivity analysis method and an overview of uncertainties and probabilistic distributions are given. The concept of system reliability is introduced, and the calculation methods of system reliability are represented. In chapter 4, loads on marine structures are introduced. In chapter 5, the procedure of calculating reliability of ship structure is introduced in detail, including identity of failure modes, calculation of loads and strength of ship structures, establishment of limit state functions, etc. Time-variant computations are outlined. Fatigue reliability is introduced. In chapter 6, reliability assessment and reliability based design code are introduced. The general method of determining partial safety factors is derived, followed by a demonstration of how partial safety factors are determined, calibrated, and used in new designs that have uniform safety. Finally an illustration is given of how probability based methods can be used to develop and calibrate codes (or design criteria) in order to produce designs with uniform safety (target safety index) over a wide range of the basic parameters involved in the design. In chapter 7, the use of QRA combined with SRA is outlined, and integrated approaches for SRA methods and QRA are presented on the basis of the classical Bayesian approach and the fully Bayesian approach, respectively. Risk analysis methodology is introduced, starting with the PHA which is often preferred in a safety context, and continuing with FMEA. It is accepted that this document has been written with more detail than would necessarily be needed for a guideline document for industrial use and would probably also need further examples and illustrations to enhance such use. Further drafting and development, needed for final publication, will be a further ASRANet activity under the relevant task group.
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Guidance on Structural Reliability Analysis of Marine Structures
Language: english
Author: Professor P.K. Das
Genre: Lectures
Format: PDF
Quality: eBook
Pages count: 181
Description: Chapter 1 reviews the structural reliability design process and presents the general procedure of structural reliability analysis. An overview of uncertainties and failure modes is given, including objective uncertainties and subjective uncertainties. A detailed description of the associated reliability concepts, definitions and notations is given. Finally, the benefits and drawbacks of using probability-based design methods are listed and the role of reliability analysis in a general probability design procedure is represented.
In chapter 2, the basic theories and methods of reliability are presented in detail. Analytical methods (approximate methods) are introduced. The direct integration method is presented, including the techniques of standardized integral region, joint probability density function, multivariate integration and advanced method of integration. Monte Carlo simulation methods and response surface methods are presented, including basic theory, with simplifications for large systems, iterative solution scheme and response surface and finite analysis etc. Suggestions are given for choosing reliability methods.
In chapter 3, the general procedure for modelling of a physical problem in a probability manner is presented, with guidance on identification of the problem. Then, to ensure the safety of the designed structure, all significant modes of failure for the structure are identified. The sensitivity analysis method and an overview of uncertainties and probabilistic distributions are given. The concept of system reliability is introduced, and the calculation methods of system reliability are represented.
In chapter 4, loads on marine structures are introduced.
In chapter 5, the procedure of calculating reliability of ship structure is introduced in detail, including identity of failure modes, calculation of loads and strength of ship structures, establishment of limit state functions, etc. Time-variant computations are outlined. Fatigue reliability is introduced.
In chapter 6, reliability assessment and reliability based design code are introduced. The general method of determining partial safety factors is derived, followed by a demonstration of how partial safety factors are determined, calibrated, and used in new designs that have uniform safety. Finally an illustration is given of how probability based methods can be used to develop and calibrate codes (or design criteria) in order to produce designs with uniform safety (target safety index) over a wide range of the basic parameters involved in the design.
In chapter 7, the use of QRA combined with SRA is outlined, and integrated approaches for SRA methods and QRA are presented on the basis of the classical Bayesian approach and the fully Bayesian approach, respectively. Risk analysis methodology is introduced, starting with the PHA which is often preferred in a safety context, and continuing with FMEA.
It is accepted that this document has been written with more detail than would necessarily be needed for a guideline document for industrial use and would probably also need further examples and illustrations to enhance such use. Further drafting and development, needed for final publication, will be a further ASRANet activity under the relevant task group.
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