Fatigue Analysis of a Mono-Tower Platform

Poul Henning Kirkegaard, John Dalsgaard Sørensen, Rune Brincker

Publikation: Bog/antologi/afhandling/rapportRapportForskning

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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
Udgivelses stedAalborg
ForlagDept. of Building Technology and Structural Engineering, Aalborg University
Antal sider23
StatusUdgivet - 1988
NavnFracture and Dynamics
Nummer9
Vol/bindR8840
ISSN0902-7513

Fingerprint

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

Bibliografisk note

PDF for print: 23 pp.

Emneord

  • Reliability Analysis
  • First-Order Reliability Methods
  • FORM
  • Sensitivity Analysis
  • Fatigue Failure
  • Random Loads
  • Offshore
  • Mono-Tower Platform

Citer dette

Kirkegaard, P. H., Sørensen, J. D., & Brincker, R. (1988). Fatigue Analysis of a Mono-Tower Platform. Aalborg: Dept. of Building Technology and Structural Engineering, Aalborg University. Fracture and Dynamics, Nr. 9, Bind. R8840
Kirkegaard, Poul Henning ; Sørensen, John Dalsgaard ; Brincker, Rune. / Fatigue Analysis of a Mono-Tower Platform. Aalborg : Dept. of Building Technology and Structural Engineering, Aalborg University, 1988. 23 s. (Fracture and Dynamics; Nr. 9, Bind R8840).
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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.",
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Kirkegaard, PH, Sørensen, JD & Brincker, R 1988, Fatigue Analysis of a Mono-Tower Platform. Fracture and Dynamics, nr. 9, bind R8840, Dept. of Building Technology and Structural Engineering, Aalborg University, Aalborg.

Fatigue Analysis of a Mono-Tower Platform. / Kirkegaard, Poul Henning; Sørensen, John Dalsgaard; Brincker, Rune.

Aalborg : Dept. of Building Technology and Structural Engineering, Aalborg University, 1988. 23 s. (Fracture and Dynamics; Nr. 9, Bind R8840).

Publikation: Bog/antologi/afhandling/rapportRapportForskning

TY - RPRT

T1 - Fatigue Analysis of a Mono-Tower Platform

AU - Kirkegaard, Poul Henning

AU - Sørensen, John Dalsgaard

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PY - 1988

Y1 - 1988

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 - Sensitivity Analysis

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KW - First-Order Reliability Methods

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KW - Sensitivity Analysis

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Kirkegaard PH, Sørensen JD, Brincker R. Fatigue Analysis of a Mono-Tower Platform. Aalborg: Dept. of Building Technology and Structural Engineering, Aalborg University, 1988. 23 s. (Fracture and Dynamics; Nr. 9, Bind R8840).