Fatigue Reliability Analysis of a Mono-Tower Platform

Poul Henning Kirkegaard, John Dalsgaard Sørensen, Rune Brincker

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

1 Citation (Scopus)

Resumé

In this paper, a fatigue reliability analysis of a Mono-tower platform is presented. The failure mode, fatigue failure in the butt welds, is investigated with two different models. The one with the fatigue strength expressed through SN relations, the other with the fatigue strength expressed through linear-elastic fracture mechanics (LEFM). In determining the cumulative fatigue damage, Palmgren-Miner's rule is applied. Element reliability, as well as systems reliability, is estimated using first-order reliability methods (FORM). The sensitivity of the systems reliability to various parameters is investigated. The systems reliability index, estimated by using the fatigue elements with the fatigue strength expressed through SN relations, is found to be smaller than the systems reliability index estimated by using LEFM. It is shown that the systems reliability index is very sensitive to variations of the natural period, damping ratio, current, stress spectrum and parameters describing the fatigue strength. Further, soil damping is shown to be significant for the Mono-tower.
OriginalsprogEngelsk
TidsskriftMarine Structures
Vol/bind4
Udgave nummer5
Sider (fra-til)413-434
Antal sider21
ISSN0951-8339
DOI
StatusUdgivet - 1991

Fingerprint

Reliability analysis
Towers
Fatigue of materials
Fracture mechanics
Damping
Miners
Fatigue damage
Failure modes
Welds
Soils
Fatigue strength

Emneord

  • Mono-Tower Platform
  • Fatigue Failure
  • LEFM
  • Linear-Elastic Fracture Mechanics
  • First-Order Reliability Methods
  • FORM
  • SN Relations
  • Random Loads
  • Offshore
  • Reliability Analysis

Citer dette

Kirkegaard, Poul Henning ; Sørensen, John Dalsgaard ; Brincker, Rune. / Fatigue Reliability Analysis of a Mono-Tower Platform. I: Marine Structures. 1991 ; Bind 4, Nr. 5. s. 413-434.
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title = "Fatigue Reliability Analysis of a Mono-Tower Platform",
abstract = "In this paper, a fatigue reliability analysis of a Mono-tower platform is presented. The failure mode, fatigue failure in the butt welds, is investigated with two different models. The one with the fatigue strength expressed through SN relations, the other with the fatigue strength expressed through linear-elastic fracture mechanics (LEFM). In determining the cumulative fatigue damage, Palmgren-Miner's rule is applied. Element reliability, as well as systems reliability, is estimated using first-order reliability methods (FORM). The sensitivity of the systems reliability to various parameters is investigated. The systems reliability index, estimated by using the fatigue elements with the fatigue strength expressed through SN relations, is found to be smaller than the systems reliability index estimated by using LEFM. It is shown that the systems reliability index is very sensitive to variations of the natural period, damping ratio, current, stress spectrum and parameters describing the fatigue strength. Further, soil damping is shown to be significant for the Mono-tower.",
keywords = "Reliability Analysis, FORM, Sensitivity Analysis, Fatigue Failure, Random Loads, Offshore, Mono-Tower Platform, First-Order Reliability Methods, Mono-Tower Platform, Fatigue Failure, LEFM, Linear-Elastic Fracture Mechanics, First-Order Reliability Methods, FORM, SN Relations, Random Loads, Offshore, Reliability Analysis",
author = "Kirkegaard, {Poul Henning} and S{\o}rensen, {John Dalsgaard} and Rune Brincker",
year = "1991",
doi = "doi:10.1016/0951-8339(91)90035-A",
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Fatigue Reliability Analysis of a Mono-Tower Platform. / Kirkegaard, Poul Henning; Sørensen, John Dalsgaard; Brincker, Rune.

I: Marine Structures, Bind 4, Nr. 5, 1991, s. 413-434.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Fatigue Reliability Analysis of a Mono-Tower Platform

AU - Kirkegaard, Poul Henning

AU - Sørensen, John Dalsgaard

AU - Brincker, Rune

PY - 1991

Y1 - 1991

N2 - In this paper, a fatigue reliability analysis of a Mono-tower platform is presented. The failure mode, fatigue failure in the butt welds, is investigated with two different models. The one with the fatigue strength expressed through SN relations, the other with the fatigue strength expressed through linear-elastic fracture mechanics (LEFM). In determining the cumulative fatigue damage, Palmgren-Miner's rule is applied. Element reliability, as well as systems reliability, is estimated using first-order reliability methods (FORM). The sensitivity of the systems reliability to various parameters is investigated. The systems reliability index, estimated by using the fatigue elements with the fatigue strength expressed through SN relations, is found to be smaller than the systems reliability index estimated by using LEFM. It is shown that the systems reliability index is very sensitive to variations of the natural period, damping ratio, current, stress spectrum and parameters describing the fatigue strength. Further, soil damping is shown to be significant for the Mono-tower.

AB - In this paper, a fatigue reliability analysis of a Mono-tower platform is presented. The failure mode, fatigue failure in the butt welds, is investigated with two different models. The one with the fatigue strength expressed through SN relations, the other with the fatigue strength expressed through linear-elastic fracture mechanics (LEFM). In determining the cumulative fatigue damage, Palmgren-Miner's rule is applied. Element reliability, as well as systems reliability, is estimated using first-order reliability methods (FORM). The sensitivity of the systems reliability to various parameters is investigated. The systems reliability index, estimated by using the fatigue elements with the fatigue strength expressed through SN relations, is found to be smaller than the systems reliability index estimated by using LEFM. It is shown that the systems reliability index is very sensitive to variations of the natural period, damping ratio, current, stress spectrum and parameters describing the fatigue strength. Further, soil damping is shown to be significant for the Mono-tower.

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KW - First-Order Reliability Methods

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KW - First-Order Reliability Methods

KW - FORM

KW - SN Relations

KW - Random Loads

KW - Offshore

KW - Reliability Analysis

U2 - doi:10.1016/0951-8339(91)90035-A

DO - doi:10.1016/0951-8339(91)90035-A

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JO - Marine Structures

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