Fatigue reliability analysis of deep water rigid marine risers associated with Morison-type wave loading |
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| Authors: | Muddassir Nazir Faisal Khan Paul Amyotte |
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| Institution: | (1) Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, NL, Canada, A1B 3X5;(2) Department of Process Engineering and Applied Science, Dalhousie University, Halifax, NS, Canada, B3J 2X4 |
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| Abstract: | This work presents a simple and efficient framework for the fatigue reliability assessment of a vertical top-tensioned rigid
riser. The fatigue damage response is considered as a narrow-band Gaussian stationary random process with a zero mean for
the short-term behavior of a riser. Non-linearity in a response associated with Morison-type wave loading is accounted for
by using a factor, which is the ratio of expected damage according to a non-linear probability distribution to the expected
damage according to a linear method of analysis. Long-term non-stationary response is obtained by summing up a large number
of short-term stationary responses. Uncertainties associated with both the strength and stress parts of the limit state function
are quantified by a lognormal distribution. A closed form reliability analysis is carried out, which is based on the limit
state function formulated in terms of Miner’s cumulative damage rule. The results thus obtained are compared with the well-documented
lognormal format of reliability analysis based on time to fatigue failure. The validity of using the lognormal hazard rate
function in predicting the fatigue life is discussed. A Monte Carlo simulation technique is also used as a reliability assessment
method. A simple algorithm is used to reduce the uncertainty associated with direct sampling at small probability of failure
values and a small number of simulations. Simulation results are compared with closed form solutions. A worked example is
included to show the practical riser design problem based on reliability analysis. |
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| Keywords: | Reliability analysis of riser Fatigue analysis Failure analysis of riser Wave loading |
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