## 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 4

Ultimate

875m . Wall thickness is 25mm in upper 360m and 16mm in lower 515m lengths .

Top angle varies from 11° to 25°from vertical under static loads . Maximum static

...

Ultimate

**Limit**State • Total length of riser from top end to riser anchor point is875m . Wall thickness is 25mm in upper 360m and 16mm in lower 515m lengths .

Top angle varies from 11° to 25°from vertical under static loads . Maximum static

...

Page 173

As is the cross - sectional area of each element M SAGGING Mu - - - ( 5 ) In order

to maintain overall equilibrium of the structure beyond the proportional

the curvature is increased the position of the neutral axis must be altered .

As is the cross - sectional area of each element M SAGGING Mu - - - ( 5 ) In order

to maintain overall equilibrium of the structure beyond the proportional

**limit**asthe curvature is increased the position of the neutral axis must be altered .

Page 228

Consider now a specific structural

containing 1 " elements " such as rebars or ... with respect to this

depends on / random variables Xi ( t ) at each of the elements belonging to the

segment .

Consider now a specific structural

**limit**state for a given structural segmentcontaining 1 " elements " such as rebars or ... with respect to this

**limit**statedepends on / random variables Xi ( t ) at each of the elements belonging to the

segment .

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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