Berthing velocity of large seagoing vessels in the port of Rotterdam

Roubos, Alfred; Groenewegen, Leon; Peters, Dirk

doi:10.1016/j.marstruc.2016.10.011

Cited by 32 publications

(20 citation statements)

References 3 publications

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“…This section concerns the methods used for deriving berthing velocities with low probabilities of exceedance in order to determine partial safety factors. OCDI [15] and Roubos et al [14] statistically examined field observations of single berthing velocities. Both studies showed that a distribution fit of the low-probability tail was closer to a Weibull distribution F(x;λ,k) than to a normal or lognormal distribution.…”

Section: Discussionmentioning

confidence: 99%

“…The tanker berths were equipped with flexible breasting dolphins provided with buckling fender systems. Studies by Yamase et al [20] and Roubos et al [14] have shown that berthing velocities are not influenced by type of marine structure or type of fendering.…”

Section: Data Collectionmentioning

confidence: 94%

“…Approximately 1393 and 555 records of berthing operations were collected in Germany and the Netherlands, respectively. The field observations regarding these berthing operations are further described by Hein [7] and Roubos et al [14]. Various types of vessels, berths and navigation conditions were represented in the datasets.…”

Section: Data Collectionmentioning

confidence: 99%

“…According to the statistical examination of extreme berthing velocities, no real correlation between berthing velocity and mass of the vessel was found for tankers in sheltered conditions. The goodness of fit of the Weibull distribution function to the individual dataset of Aframax tankers was low and should be used with care [14]. In practice, characteristic values of berthing velocity are generally higher than 10 cm/s.…”

Section: Figure 8: Characteristic Berthing Velocities Compared With Pmentioning

confidence: 99%

“…Ueda et al [19] showed that berthing velocity is the most important design parameter in defining berthing energy. The port authorities of Bremerhaven [7] and Rotterdam [14] therefore decided to start a measurement campaign on berthing velocity in order to evaluate and validate the performance of existing berthing facilities and the design guidance of EAU and PIANC. They wanted to know whether the berthing velocity curves of EAU and PIANC, presented in Figure 1, are still representative of and safe for modern vessels.…”

Section: Introductionmentioning

confidence: 99%

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Partial safety factors for berthing velocity and loads on marine structures

Roubos

Peters

Groenewegen³

et al. 2018

Marine Structures

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Design methods for marine structures have evolved into load and resistance factor design, however existing partial safety factors related to berthing velocity and loads have not been verified and validated by measurement campaigns. In this study, field observations of modern seagoing vessels berthing in Bremerhaven, Rotterdam and Wilhelmshaven were used to evaluate partial safety factors for berthing energy and berthing impact loads. Various types of vessels and navigation conditions were statistically examined. The results show that characteristic values of berthing velocity with a return period of 50 years are in line with design recommendations in literature. Design values of berthing velocity are sensitive to the number of berthing operations during the lifetime of a marine structure. Typical partial safety factors for sheltered and exposed navigation conditions were derived by extrapolating distribution fits and applying extreme value theory. Differences in structural response due to soil stiffness and the type of berthing system installed influence partial safety factors for berthing impact loads. The probability of an uncontrolled berthing event was higher for exposed navigation conditions (strong tidal currents). In these circumstances, higher partial safety factors for berthing velocity should be considered in the design of marine structures. When berthing aid systems are used, the probability of extreme berthing velocities is lower, resulting in lower partial safety factors. The key findings of this study could be beneficial for the structural design of new and lifetime extension of existing marine structures.

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Section: Discussionmentioning

confidence: 99%

Section: Data Collectionmentioning

confidence: 94%

Section: Data Collectionmentioning

confidence: 99%

Section: Figure 8: Characteristic Berthing Velocities Compared With Pmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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