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Flutter responses in long span bridges with wind induced displacement by the mode tracing method
The problem of flutter prediction for the complex 3D, finite element model of a long span bridge has been addressed. Based on a reasonable assumption that the vibration mode does not change abruptly for a gradual increase in the wind speed, a numerical, mode-iteration scheme is proposed. The method is like tracing the system complex mode when the mean wind speed increases; therefore could be used to describe the dynamic behavior before flutter as well. By iteration in function of the mean wind, its effect and the change in the structure configuration and stress can be easily incorporated into the calculation. The final result is thus closer to the reality. The flutter behavior and flutter modes from the mode tracing method can also be used for the buffeting analysis. Once the complex modes and complex modal forces are known, the modal equation can be formed and a time history integration can be carried out to determine the buffeting responses. A numerical example based on the full model bridge has been conducted and compared with the data of experiments on 3D model in a wind tunnel. The results obtained have shown that the method is accurate and computationally efficient among the full model analysis methods.
Flutter responses in long span bridges with wind induced displacement by the mode tracing method
The problem of flutter prediction for the complex 3D, finite element model of a long span bridge has been addressed. Based on a reasonable assumption that the vibration mode does not change abruptly for a gradual increase in the wind speed, a numerical, mode-iteration scheme is proposed. The method is like tracing the system complex mode when the mean wind speed increases; therefore could be used to describe the dynamic behavior before flutter as well. By iteration in function of the mean wind, its effect and the change in the structure configuration and stress can be easily incorporated into the calculation. The final result is thus closer to the reality. The flutter behavior and flutter modes from the mode tracing method can also be used for the buffeting analysis. Once the complex modes and complex modal forces are known, the modal equation can be formed and a time history integration can be carried out to determine the buffeting responses. A numerical example based on the full model bridge has been conducted and compared with the data of experiments on 3D model in a wind tunnel. The results obtained have shown that the method is accurate and computationally efficient among the full model analysis methods.
Flutter responses in long span bridges with wind induced displacement by the mode tracing method
Dung, N.N. (Autor:in) / Miyata, T. (Autor:in) / Yamada, H. (Autor:in) / Minh, N.N. (Autor:in)
1998
13 Seiten, 9 Quellen
Aufsatz (Konferenz)
Englisch
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