## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 2American Society of Mechanical Engineers, 2001 - Arctic regions |

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Page 103

OMAE2001 / S & R - 2118 ABSTRACT This paper presents uncertainties in the

spectral fatigue

used .

OMAE2001 / S & R - 2118 ABSTRACT This paper presents uncertainties in the

spectral fatigue

**damages**of offshore structures , which are ... In the fatigue**damage**, there are additional uncertainties that related to the damagemodelused .

Page 107

continuous long - term distribution of sea states , the total

calculated from Eq . ( 1 ) . For a multi - linear S - N model , the mean

stress cycle of a non narrow - banded stress process , E [ DD ] , is calculated from

...

continuous long - term distribution of sea states , the total

**damage**will becalculated from Eq . ( 1 ) . For a multi - linear S - N model , the mean

**damage**for astress cycle of a non narrow - banded stress process , E [ DD ] , is calculated from

...

Page 399

With a limited number of runs , the

to : D ( H ) = a HP with an exponent p almost half of m , that would be expected if

the response was linear , thus showing the predominance of quadratic damping ...

With a limited number of runs , the

**damage**along this line can be approximatedto : D ( H ) = a HP with an exponent p almost half of m , that would be expected if

the response was linear , thus showing the predominance of quadratic damping ...

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acceptable analysis applied approach assessment associated assumed calculated coefficient combined components considered corresponding corrosion cost crack criteria damage dependent depth determined developed directional distribution dynamic effect element Engineering environmental equation estimate evaluated example expressed extreme factor failure fatigue Figure force frequency function fuzzy given important increase initial inspection limit load loss maintenance marine maximum mean measures Mechanics method motion normal observed obtained offshore operations parameters peak performed period pipe pipeline platform possible prediction present probability procedure production random range relative reliability represented response return period riser risk safety ship shown shows significant simulation spectral spectrum statistical steel storm strength stress structure surface Table theory typical uncertainty variables wave height wind