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Approche probabiliste du comportement élasto-plastique de structures marines, sous sollicitations aléatoires de houle

Abstract : This work studies the reliability analysis of a Jacket-type offshore structure, under the action of wave forces. The mechanical model includes various elasto-plastic diagrams with and without the combination of the normal force and the bending moment. A diminution of the normal force is introduced in order to account for buckling. A linearisation is introduced for easier application. The dynamic wave forces on the structure are assumed to have zero mean, Gaussian characteristics (a gaussian stationnary and ergodic random process with zero mean value) when suitably linearized. The safety index is computed, for each failure limit state of the system, by the branch and bound method, with the help of equivalent hyperplanes in a first order approximation; an hybrid method is also developed, which requires a Monte-Carlo simulation. Two examples of a portal frame structure and a jacket-type offshore structure illustrate this approach and show the effect of considering the interaction between the normal force and the bending moment (in comparison with the axial force effect only or bending moment effect only) in the reliability level of a system. Finally, the methodology proposed in this work, to estimate the reliability of offshore structures subjected to wave actions, allows to study the variation of probability of mechanical system failure, according to the design criteria. It allows too to establish the criterias of the desirable safety level, and could be useful for a larger class of problems.
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  • HAL Id : tel-00523059, version 1

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Moisés Arroyo-Contreras. Approche probabiliste du comportement élasto-plastique de structures marines, sous sollicitations aléatoires de houle. Matériaux. Ecole Nationale des Ponts et Chaussées, 1989. Français. ⟨tel-00523059⟩

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