Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 9, Part 2American Society of Mechanical Engineers, 1990 - Arctic regions |
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Page 65
... tether , the risk of consecutive fatigue failures and the risk of progressive collapse of other tethers are assessed . The failure probability of the platform is calculated on the loss of one tension leg ; each tension leg being ...
... tether , the risk of consecutive fatigue failures and the risk of progressive collapse of other tethers are assessed . The failure probability of the platform is calculated on the loss of one tension leg ; each tension leg being ...
Page 68
... tether midpoint is bending , which corresponds to 14 % of the total stress , the loading along the tether can be expressed by considering the parabolic distribution of the bending stress as a function of d o ( 8 ) = max ( 0.86 +0.568 ...
... tether midpoint is bending , which corresponds to 14 % of the total stress , the loading along the tether can be expressed by considering the parabolic distribution of the bending stress as a function of d o ( 8 ) = max ( 0.86 +0.568 ...
Page 69
Upon the first tether failure , the axial variable stress in the remaining tethers in the same leg increases by a ... tether in 41 years is calculated as 2.30 10-3 ; while that in 40 years is 1.68 10-3 . Therefore , the failure ...
Upon the first tether failure , the axial variable stress in the remaining tethers in the same leg increases by a ... tether in 41 years is calculated as 2.30 10-3 ; while that in 40 years is 1.68 10-3 . Therefore , the failure ...
Contents
Investigation of the Ergodicity Assumption for Sea States in the Reliability Assessment of Offshore | 1 |
OFFSHORE TECHNOLOGY PART | 19 |
Fatigue Loading | 33 |
Copyright | |
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analysis applied approach approximately assessment assumed average basic calculated coefficient component computed considered constant corresponding cost crack growth curve cycles damage defect density depends depth derived described determined developed deviation distribution drag effects Engineering equation equivalent estimated evaluated example expected extreme factor failure failure probability fatigue Figure force fracture frequency function geometry given important included increase indicated initial inspection integration joints limit linear load Lognormal material maximum mean measured mechanics method normal obtained offshore structures operation parameters performed period platform predicted present pressure probabilistic probability procedure random variable range ratio reference relative reliability represent requirements respectively response risk safety shown shows significant simulation standard statistical storm strength stress structure surface Table tension tether tubular uncertainty variables variation wave wave height weld