## 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

Besides uncertainties associated with the modelling of structures and the random

wave environment , there are also uncertainties arising from degradation of

member

section ...

Besides uncertainties associated with the modelling of structures and the random

wave environment , there are also uncertainties arising from degradation of

member

**stiffness**due to a joint flexibility and ovalization of member cross -section ...

Page 104

It has been shown ( Karadeniz , 1994 ) that

consistent load vector of a flexibly connected member can be expressed in

decremental forms as , ( 2 ) UNCERTAINTIES RELATED TO THE SPECTRAL

ANALYSIS ...

It has been shown ( Karadeniz , 1994 ) that

**stiffness**matrix , mass matrix andconsistent load vector of a flexibly connected member can be expressed in

decremental forms as , ( 2 ) UNCERTAINTIES RELATED TO THE SPECTRAL

ANALYSIS ...

Page 105

The matrices , [ MK ] , [ uki ) , [ 1 ks ] and [ H kg ) , are respectively the mean

values of the system

and ovalization , joint flexibility and foundation . In this modelling , the mean

values of ...

The matrices , [ MK ] , [ uki ) , [ 1 ks ] and [ H kg ) , are respectively the mean

values of the system

**stiffness**matrix and those related to member thicknessesand ovalization , joint flexibility and foundation . In this modelling , the mean

values of ...

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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 growth 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 storm strength stress structure surface Table theory typical uncertainty variables wave height wind