Analyse av vind-indusert respons av en hengebro på flytende fundamenter
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As a part of a nation-wide project to create a ferry-free coastal highway route, several fjord-crossings need to be evaluated for construction of long spanned bridges. Such a crossing lies between the municipalities of Sula and Hareid in the county of Møre og Romsdal. A proposition for such bridge is the Sulafjorden bridge, which would consist of three suspended spans, two land towers and two towers on floating support. The purpose of this thesis is to investigate how difference in girder discretization of such a long-spanned suspension bridge would affect the response due to wind turbulence. With the purpose of setting a theoretic foundation for the thesis, a literature review is initially presented about wind related themes. Further, a parametric study of how modal loading affects different discretization levels of the span of a simplified bridge model is done. Moreover, an existing FEM model of Sulafjorden bridge is remodeled and analyzed with respect to static and dynamic wind conditions. Lastly, a sensitivity study in frequency domain is implemented to evaluate how changes in discretization of the span of Sulafjorden bridge may affect the resulting power spectral density. As a result of these investigations, it would seem that an increase in discretization of the bridge girder from 20m to 10m girder element length would result in a reduction of response of the standard deviation of the lateral displacement at center of span by 0.2% and for vertical displacement by 1.5%. Further, mean lateral and vertical displacement is proved to have similar characteristics in response as the standard deviation. Moreover, difference in standard deviation of vertical displacement between 10m and 40m girder element length is determined to be 3% at center of span, which could suggest that such a discretization level might not sufficiently capture enough details in the turbulent vertical wind field compared to in-situ natural conditions.
Masteroppgave - Universitetet i Stavanger. Det teknisk-naturvitenskapelige fakultet. Master i teknologi – Konstruksjoner og materialer. Fordypning Byggkonstruksjoner.