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Dynamic Analysis of Floating Bridges with Transverse Pontoons
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Marine Technology.
2014 (English)MasteroppgaveStudent thesis
Abstract [en]

The main objective of this thesis is to analyse the dynamic response of floating bridges with transverse pontoons, when subjected to harmonic regular wave loads. As a result, a simplified beam model of the Bergsøysundet floating bridge is established in the FEM software Abaqus. Additional “synthetic” floating bridge structures are subsequently built and analysed in a similar manner. The pontoon model already developed in Genie by Abdillah Suyuthi is analysed in HydroD to obtain the pontoon’s structural model and hydrodynamic parameters. In addition to these parameters, by implementing his calculated data of mass and sectional properties of the bridge truss-work components, the simplified beam model of the bridge is developed in Abaqus. Taking the Bergsøysundet floating bridge model as the basis, “synthetic” bridge models are similarly assembled and studied. The effect of sideway mooring is also considered for some of the models. Eigenfrequency analysis is then carried out in Abaqus in order to determine the frequency of the fundamental mode of a model. The eigenfrequency and added mass are updated by iteration until they are concurrent. Static and dynamic analysis are then carried out for the model. The regular wave load corresponding to the updated frequency of the mode is acquired from the hydrodynamic analysis in HydroD and applied in Abaqus. Efficient techniques are presented to calculate the phase difference at each pontoon. This arises due to the combined effect of changing wave direction and shapes of the models. A simplified method is employed to gauge the critical angle of wave heading. The effect of wave spreading is also assessed in a streamlined manner based on discussion with the supervisor. Limitations with regard to the non application of full matrices of the pontoon’s structural model and hydrodynamic parameters are highlighted. Negatively damped sway motions are controlled by the application of external lateral dampers. Mixed results are obtained at the estimated critical angles. Better result is obtained by iteration of the responses for growing angles of wave heading. The wave spreading response result is satisfying

Place, publisher, year, edition, pages
Institutt for marin teknikk , 2014. , 107 p.
URN: urn:nbn:no:ntnu:diva-25640Local ID: ntnudaim:10810OAI: diva2:738204
Available from: 2014-08-15 Created: 2014-08-15 Last updated: 2014-08-15Bibliographically approved

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