Effects of frequency ratio on the aerodynamic and dynamic properties of bridge decks

Xiao Qin, Kenny C. S. Kwok, C. H. Fok, Peter A. Hitchcock

    Research output: Chapter in Book / Conference PaperConference Paper

    Abstract

    ![CDATA[A series of wind tunnel sectional model dynamic tests were conducted to examine the effects of torsional-to-vertical natural frequency ratio on the aerodynamic and dynamic properties of bridge decks. The natural frequency ratios tested were around 2.2:1 and 1.2:1 respectively, with the fundamental vertical natural frequency held constant for all the tests. Two 2.9 m long sectional bridge models, one simulating the cross-section of a twin-deck bridge with a gap-width to total chord ratio of about 16% and the other with zero gap-width to approximate a thin plate, were tested to determine whether the effects of frequency ratio are similar for bridge decks with different cross-section shapes. The results of wind tunnel tests suggest that for the model with zero gap-width, the flutter derivatives are relatively independent of the torsional-to-vertical frequency ratio for a relatively large range of reduced wind velocities. However, for the model with a relative large gap-width (around 16%), the flutter derivatives are evidently dependent on the frequency ratio for most of the tested reduced velocities. A comparison of the modal damping ratios also suggests that the torsional damping ratio is much more sensitive to the frequency ratio, especially for the model with a 16% gap-width. The results of this investigation show that the torsional-to-vertical natural frequency ratio is an important structural parameter, which can significantly affect wind-structure interaction.]]
    Original languageEnglish
    Title of host publicationProceedings of PVP2006-ICPVT-11: 2006 ASME Pressure Vessels and Piping Division Conference, July 23-27, 2006, Vancoucer, BC, Canada
    PublisherASME
    Number of pages1
    Publication statusPublished - 2006
    EventInternational Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibrations & Noise -
    Duration: 1 Jan 2006 → …

    Conference

    ConferenceInternational Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibrations & Noise
    Period1/01/06 → …

    Keywords

    • bridge decks
    • frequencies of oscillating systems
    • dynamics
    • aerodynamics
    • wind tunnel testing

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