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Aerodynamic stability of slender suspension bridges
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Structural Engineering.
2013 (English)MasteroppgaveStudent thesis
Abstract [en]

This thesis studies the aerodynamic stability of a proposed suspension bridge crossing the Sognefjord. Such a bridge will require a main span of approximately 3700 m, almost double the span length of the current record holder. For such a long span and slender suspension bridge its aerodynamic properties are highly important. A comparison of the aerodynamic stability limits using three different configurations of a so-called vented or dual box girder has been done. The only difference in each configuration is the center-to-center distance between the individual box girders. The design of the individual girders and the cable system is kept constant. A modal approach to solving the equation of motion has been employed where the eigenfrequencies and eigenmodes have been computed using a computer program called ALVSAT. The numerical calculations of stability limits as well as dynamic response have been done using self-written MATLAB scripts based on well-established theory of bridge aerodynamics. Aerodynamic derivatives from wind tunnel tests have been obtained from a report on the similar cross section of the proposed Brusymfonien bridge. The results obtained show an increasing critical mean wind velocity with increasing the center-to-center widths between the box sections. For the widest dual box girder, no stability limits were found. The response results confirm the stability limits and indicate a stabilization effect of the dual box girders at wind velocities below the point of modal coupling.

Place, publisher, year, edition, pages
Institutt for konstruksjonsteknikk , 2013. , 128 p.
URN: urn:nbn:no:ntnu:diva-22274Local ID: ntnudaim:9340OAI: diva2:648729
Available from: 2013-09-16 Created: 2013-09-16 Last updated: 2013-09-16Bibliographically approved

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