Print Email Facebook Twitter Deformable and energy absorbing protection against ship collision Title Deformable and energy absorbing protection against ship collision Author van Oorschot, N. Contributor Jonkman, S.N. (mentor) van der Toorn, A. (mentor) Peters, D.J. (mentor) Verheij, H.J. (mentor) Fousert, M.W. (mentor) Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 2017-07-06 Abstract The Netherlands is a country where people have to live with water, rather than fighting against it. This philosophy often requires interaction between infrastructure and waterways, where (hydraulic) structures are placed close to or even extending in the waterway, introducing the risk of ship collision. What makes this accidental load so problematic is the magnitude of these forces, caused by the combination of a very high mass moving with a sizeable velocity. Since structures are often not able to withstand the high impact energy, this requires the design of separate protective structures. This research focusses on the concept of mitigating these damages, limiting the plastic deformation to specific parts of the structure which can easily be replaced. In order to find an answer to the research question, it is important to gain more insight in the problem of ship collision and the solutions that are currently available. This achieved by gathering available data about shipping accidents that happened in the Netherlands, which show that the problem of ship collision is something that has a large impact on the design of structures, and has been for several years. Solving the problem of ship collision starts with a proper determination of the magnitude and the relation between both the collision energy and the forces required to safely disperse it. The methods prescribed by the Eurocode, the CETMEF and the AASHTO are consulted. Finally an overview of the currently available methods was established. At this stage of the research, some proper insight was gained in how the problem of ship collision was handled in the years leading up to this one. By taking a closer look at the techniques used in other branches, a set of three alternatives was brought up. Before making a selection between the two alternatives, a feasibility study has been executed, validating that the concepts actually worked as expected. A selection between the alternatives was made by a Multi Criteria Analysis, where each of the alternatives was scored on a list of weighed criteria. According to this analysis, the sandwich panels proved to be the better alternative. Since the design has been based solely on assumptions rather than properties of an existing location, a case was introduced. In December of 2016 a ship collided with a section of the weir in Grave, providing for a topical case, hence the design is based on the centre pier of the bridge/weir structure. Based on a combination of the original sketches and a risk analysis carried out a few years ago, it was possible to identify the static loads that act on the centre pier. Minor alterations to the design of the sandwich panels made it possible to fit them to the pier, where the dimensions of the hexagon mesh combined with the properties of the design ship resulted in a value of the resulting collision force on the pier. The high magnitude of the horizontally acting collision force might introduce problems to the stability of the shallow foundation of the structure. The method prescribed by the Eurocode was used to validate the stability of the structure both the current situation and the updated situation where the resulting collision force is acting on the structure. The results of the calculations showed that the structure proved to be stable under each of the checked loading situations. Validation of the stability was the final step of this thesis research. Future research is required to optimise the design and properly model the problem, but the resulting design is a strong starting point for this design problem. Subject Ship collisionCollision protectionSandwich panelsRIMOBGraveConceptual designHydraulic structureMCAMulti-criteria analysisFeasibility study To reference this document use: http://resolver.tudelft.nl/uuid:5f36aa9e-a23a-4418-9397-86fc731459bb Coordinates 51.768923, 5.735676 Part of collection Student theses Document type master thesis Rights (c) 2017 van Oorschot, N. Files PDF MScThesis_NvanOorschot.pdf 34.54 MB Close viewer /islandora/object/uuid:5f36aa9e-a23a-4418-9397-86fc731459bb/datastream/OBJ/view