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dc.contributor.advisorLeira, Bernt Johan
dc.contributor.authorLund, Kristina Husevåg
dc.date.accessioned2017-09-18T14:01:27Z
dc.date.available2017-09-18T14:01:27Z
dc.date.created2017-06-09
dc.date.issued2017
dc.identifierntnudaim:17220
dc.identifier.urihttp://hdl.handle.net/11250/2455246
dc.description.abstractDuring the project Ferry-free coastal route E39, directed by National Public Road Administration, NPRA, seven ferry-crossings are intended to be replaced by straight crossing. One of these is Bjrnafjorden, where a proposed crossing is a multi-span suspension bridge, supported by two tension leg platforms, TLPs. A simplied model of this proposed crossing was created in Abaqus/CAE. Further, three additional models were created to study how the number of supports and alteration of cross-section aect the responses. The rst two horizontal eigenfrequencies were compared to available eigenfrequencies from NPRA. All models had higher eigenfrequencies, which indicates that the models are stier, or that the mass and added mass are smaller, or a combination. For the static analysis, three loads were applied. These were current at the oater and trac and wind along the bridge. The environmental loads were determined for 1-year, 50-year and 100-year return periods. The longitudinal and vertical displacement along the bridge, in addition to bending moment, were determined for every model. When the number of supports were increased, the vertical displacement was signicantly reduced, while the largest vertical displacement occurred for the model with reduced thickness of the horizontal beams in the cross-section. This was also true for the longitudinal displacement when only the environmental loads were applied. For the dynamic analysis, an incoming harmonic wave was applied in horizontal and vertical direction at the oater. Two wave periods were utilized; the rst is a feasible period and the second is the rst obtained eigenperiod. Resonance caused signicantly larger motions for the oaters. Generally, a reduction of the crosssection's thickness on horizontal beams resulted in an increased sway response, while the largest response in heave occurred for a reduced cross-section height.
dc.languageeng
dc.publisherNTNU
dc.subjectMarin teknikk, Marin konstruksjonsteknikk
dc.titleDescription and Analysis of Floating Bridges
dc.typeMaster thesis


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