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Selected problems of sensitivity and reliability of a jack-up platform

100%

Rozmarynowski B. , Mikulski T.

tom nr 1

77--84

The paper deals with sensitivity and reliability applications to numerical studies of an off-shore platform model. Structural parameters and sea conditions are referred to the Baltic jack-up drilling platform. The sudy aims at the influence of particular basic variables on static and dynamic response as well as the probability of failure due to water waves and wind loads. The paper presents the sensitivity approach to a generalized eigenvalue problem and evaluation of the performace functions. The first order time-invariant problems of structural reliability analysis are under concern.

Structural assessment of the hull response of an fpso unit to dropped objects: a case study

100%

Ozguc O.

2019

tom nr 4

39--46

Offshore structures are exposed to the risk of damage caused by various types of extreme and accidental events, such as fire, explosion, collision, and dropped objects. These events cause structural damage in the impact area, including yielding of materials, local buckling, and in some cases local failure and penetration. The structural response of an FPSO hull subjected to events involving dropped objects is investigated in this study, and non-linear finite element analyses are carried out using an explicit dynamic code written LS-DYNA software. The scenarios involving dropped objects are based on the impact from the fall of a container and rigid mechanical equipment. Impact analyses of the dropped objects demonstrated that even though some structural members were permanently deformed by drop loads, no failure took place in accordance with the plastic strain criteria, as per NORSOK standards. The findings and insights derived from the present study may be informative in the safe design of floating offshore structures.

Hydrodynamics of offshore structures under waves and current: fundamental theory, formulation of the problem and a case study

75%

Mendes A. C.

tom Vol. 20

34--57

This lecture is devoted firstly to a statement of the physical properties of gravity waves that is followed by a review on Linear Theory of waves of small amplitude, together with the related basic equations. This material includes the calculation of water pressure and water-particle kinematics, and the establishment of mass, momentum and energy balances. On a second stage it will be given a comprehensive material concerning the methodologies applied to calculate the wave forces. In the present case we will be involved with the Morison model and the corresponding hydrodynamic coefficients, when predicting the wave forces exerted upon tubular structures. Finally, a case study will be presented, relating both theoretical and experimental results obtained with a physical model of an offshore jacket platform.

Podstawy budowy modelu niezawodnościowego elementów nośnych konstrukcji oceanotechnicznych

75%

Rosochacki W.

tom nr 19 (91)

92-96

W artykule podjęto temat podstaw budowy matematycznego modelu niezawodności elementów nośnych konstrukcji okrętowych probabilistycznie jednorodnych. W modelu uwzględniono trzy typy uszkodzeń: trwałe odkształcenie plastyczne, pęknięcia zmęczeniowe oraz utratę stateczności lokalnej. W szczególności zaproponowano i określono cechy i granice obszarów zdatności. Proponowany model uwzględnia zmiany właściwości elementu jako skutku działania obciążeń cyklicznych.

The paper describes basis of the model for reliability analysis of probabilistically homogenous offshore structures bearings. Three types of damages were considered: permanent plastic strain, fatigue crack and local instability. Specifically, features and limits of ability areas were proposed and determined. In this article was also investigated the influence of variation of element properties as an effect of cyclic loading action.