Print Email Facebook Twitter Partial safety factors for berthing velocity and loads on marine structures Title Partial safety factors for berthing velocity and loads on marine structures Author Roubos, A.A. (TU Delft Hydraulic Structures and Flood Risk; Port of Rotterdam Authority) Peters, D.J. (TU Delft Hydraulic Structures and Flood Risk; Royal HaskoningDHV) Groenewegen, Leon (Delta Marine Consultants) Steenbergen, R. (TNO; Universiteit Gent) Date 2018 Abstract 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.The results from this paper are included in the international draft directive“Berthing velocities and fender design” van PIANC WG145 Subject Partial safety factorBerthing velocityBerthing energyBerthing impactBerthing loadMarine structures To reference this document use: http://resolver.tudelft.nl/uuid:8c2e8cbb-7496-4cee-b390-0c7b581b3384 DOI https://doi.org/10.1016/j.marstruc.2017.11.003 Embargo date 2019-11-01 ISSN 0951-8339 Source Marine Structures, 58, 73-91 Part of collection Institutional Repository Document type journal article Rights © 2018 A.A. Roubos, D.J. Peters, Leon Groenewegen, R. Steenbergen Files PDF Manuscript_revised_12_10_2017.pdf 1.27 MB Close viewer /islandora/object/uuid:8c2e8cbb-7496-4cee-b390-0c7b581b3384/datastream/OBJ/view