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Probabilistic foundation stability analysis for gravity base structures
It is desirable to adopt a more consistent approach for prediction of foundation performance of offshore gravity base structures. This is especially important where novel designs or design procedures are involved. Reliability engineering has the potential to provide the framework for rational design decisions, as uncertainties in the design parameters and the associated likelihood of adverse performance can be accounted for directly. This thesis presents probabilistic calculation techniques which are tailor-made for reliability assessment of gravity base structure foundations. An important part of the thesis is a probabilistic formulation of the Norwegian Geotechnical Institute (NGI) cyclic shear strength analysis for calculation of the bearing capacity of offshore structures subjected to combined static and cyclic loading. This calculation procedure ensures strain compatibility in the soil along the potential failure surface and accounts for the redistribution of average stresses caused by cyclic loading. The probabilistic calculation procedure includes: Determination of cyclic shear strength, iterative equilibrium calculations, and system reliability analysis to evaluate the results from the iterative equilibrium calculations. The key geotechnical item in the probabilistic formulation is the determination of the uncertainty in the cyclic shear strength of the foundation soil. The thesis presents a method to estimate this uncertainty by using simulation techniques and Latin Hypercube Sampling of the random variables which influence the uncertainty in the cyclic shear strength.
Probabilistic foundation stability analysis for gravity base structures
It is desirable to adopt a more consistent approach for prediction of foundation performance of offshore gravity base structures. This is especially important where novel designs or design procedures are involved. Reliability engineering has the potential to provide the framework for rational design decisions, as uncertainties in the design parameters and the associated likelihood of adverse performance can be accounted for directly. This thesis presents probabilistic calculation techniques which are tailor-made for reliability assessment of gravity base structure foundations. An important part of the thesis is a probabilistic formulation of the Norwegian Geotechnical Institute (NGI) cyclic shear strength analysis for calculation of the bearing capacity of offshore structures subjected to combined static and cyclic loading. This calculation procedure ensures strain compatibility in the soil along the potential failure surface and accounts for the redistribution of average stresses caused by cyclic loading. The probabilistic calculation procedure includes: Determination of cyclic shear strength, iterative equilibrium calculations, and system reliability analysis to evaluate the results from the iterative equilibrium calculations. The key geotechnical item in the probabilistic formulation is the determination of the uncertainty in the cyclic shear strength of the foundation soil. The thesis presents a method to estimate this uncertainty by using simulation techniques and Latin Hypercube Sampling of the random variables which influence the uncertainty in the cyclic shear strength.
Probabilistic foundation stability analysis for gravity base structures
T. R. Guttormsen (author)
1991
340 pages
Report
No indication
English
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