Recent Advances in Risk Based Inspection Planning for Structures

Straub, Daniel; Faber, Michael Havbro

doi:10.1007/978-0-85729-410-4_388

Cited by 38 publications

(45 citation statements)

References 8 publications

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“…The theoretical basis for risk-based planning of inspection and maintenance for fatigue critical details and for applications in offshore steel substructures is described in e.g., Faber et al [2], Moan [3], Madsen and Sørensen [14], Skjong [15], Straub [16] and Sørensen [17]. Fatigue reliability analysis of jacket-type offshore wind turbine considering inspection and repair is also considered in Dong et al [18] and Rangel-Ramírez and Sørensen [19].…”

Section: Reliability-based Inspection Planningmentioning

confidence: 99%

Fatigue Reliability and Calibration of Fatigue Design Factors for Offshore Wind Turbines

Márquez-Domínguez

Sørensen

2012

Energies

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Consequences of failure of offshore wind turbines (OWTs) is in general lower than consequences of failure of, e.g., oil & gas platforms. It is reasonable that lower fatigue design factors can be applied for fatigue design of OWTs when compared to other fixed offshore structures. Calibration of appropriate partial safety factors/Fatigue Design Factors (FDF) for steel substructures for OWTs is the scope of this paper. A reliability-based approach is used and a probabilistic model has been developed, where design and limit state equations are established for fatigue failure. The strength and load uncertainties are described by stochastic variables. SN and fracture mechanics approaches are considered for to model the fatigue life. Further, both linear and bi-linear SN-curves are formulated and various approximations are investigated. The acceptable reliability level for fatigue failure of OWTs is discussed and results are presented for calibrated optimal fatigue design factors. Further, the influence of inspections is considered in order to extend and maintain a given target safety level.

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Section: Reliability-based Inspection Planningmentioning

confidence: 99%

Fatigue Reliability and Calibration of Fatigue Design Factors for Offshore Wind Turbines

Márquez-Domínguez

Sørensen

2012

Energies

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“…The methodology can be extended to a posterior decision analysis implementing the conditional value of sample information (Straub, 2004). Also the consideration of past satisfactory performance can be included in the analyses (Holicky et.al., 2014.…”

Section: B/c Fmentioning

confidence: 99%

Optimal decisions based on monitoring – case study of steel roof

Lenzi¹,

Diamantidis²,

Sýkora³

2017

Proceedings of the Joint COST TU1402 - COST TU1406 - IABSE WC1 Workshop: The Value of Structural Health Monitoring for the Reli

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Abstract. Monitoring of structures and related decisions based on cost optimization are discussed in this contribution. Many research publications and experimental data are currently available on inspection and on monitoring and they represent the outcome of the remarkable work done. Not all the topics of interest are widely debated and implemented in standards. The current state-of-practice in standards is summarized and aspects to be included in future recommendations are proposed.The implementation of risk-based decisions is illustrated in a case study dealing with a stadium roof in Northern Italy. Snow actions are important especially in northern and mountainous regions where heavy snowfalls and related accumulation result to considerable loads. As the roof structure fails to comply with the requirements of Eurocodes, a permanent monitoring system has been installed to allow for real time evaluation of the reliability level of the structure. The system supplies the necessary information supporting immediate decisions on closure of the stadium in case of an extraordinary snow load. Cost-optimal decisions regarding the closure of the stadium are analysed based on a limit state function, on probabilistic models for the influencing parameters including measurement uncertainty, economic losses related to closure and failure consequences. The results demonstrate the potential of the use of the monitoring systems and probabilistic reliability analysis in order to support decisions and highlight the need for their implementation in future standards.

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“…In the context of fatigue deterioration, the relevant inspection events are detection/no-detection of a fatigue crack and measurement of the size of a detected fatigue crack (Straub 2004). In the current study, we assume that any inspection of any element results in a no-detection event.…”

Section: Inspection Modelingmentioning

confidence: 99%

“…Skjong (1985), Madsen et al (1987), Thoft-Christensen and Sørensen (1987), Fujita et al (1989), Sørensen et al (1991), Moan et al (2000b), Faber et al (2000) and Straub (2004). These methods have mainly focused on individual structural components neglecting the effect of stochastic dependence among element deterioration behavior because of computational limitations, see Straub and Faber (2005) for more details.…”

Section: Introductionmentioning

confidence: 99%