## 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 105

The

to structure - water interactions and the structural

also assumed to be uncertain because of its variation during a service lifetime .

The

**mass**matrix contains uncertainties that arise mainly from added**masses**dueto structure - water interactions and the structural

**mass**. The**mass**of the deck isalso assumed to be uncertain because of its variation during a service lifetime .

Page 270

M is the total effective

hydrodynamic

% to 70 % hydrodynamic

directly ...

M is the total effective

**mass**of the structure , which include live , dead andhydrodynamic

**masses**( often the total**mass**of an offshore structure is about 50% to 70 % hydrodynamic

**mass**) . Be is the design safety index for the structure (directly ...

Page 301

( x , z , 1 ) where p is the

the diameter of the generic column . In eq . ( 4 ) , ü ( x , , 1 ) is the water particle

acceleration , which is a zeromean , Gaussian and stationary process , related to

...

( x , z , 1 ) where p is the

**mass**density of the water , C , is the inertia coefficient , Dthe diameter of the generic column . In eq . ( 4 ) , ü ( x , , 1 ) is the water particle

acceleration , which is a zeromean , Gaussian and stationary process , related to

...

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