New consideration on flutter properties based on step-by-step analysis |
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Authors: | Masaru Matsumoto Hisato Matsumiya Shinya Fujiwara Yasuaki Ito |
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Affiliation: | 1. Kyoto University, Department of Civil & Earth Resources Engineering, Kyotodaigaku-katsura, Nishikyo-ku, Kyoto, Japan;2. Central Research Institute of Electric Power Industry, Japan;3. OSAKA GAS CO. LTD., Japan;4. Shimizu Corporation, Japan |
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Abstract: | This paper studies the coupled flutter mechanism of plate and long span bridges based on step-by-step analysis (SBS). Fundamental flutter modes are defined based on amplitude ratio and phase difference between heaving and torsional motions. Furthermore, a formula remarkably similar to the Selberg formula can be derived by use of the particular simplified flutter-onset condition. In the process of SBS analysis, some torsional divergent velocities where the torsional rigidity becomes zero can be defined. Finally, the flutter-behavior of an elastic model of the complete Akashi-Kaikyo Bridge, which is the longest suspension bridge in the world, is studied from the point of view of flutter in 2 degrees of freedom, namely heaving and torsional motion, taking into account the structural coupling effect of additional torsional displacement induced by horizontal displacement as a structural coupling property. |
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