3D refined flutter analysis of long-span suspension bridges

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 246-253.

ZHANG Xinjun, ZHAO Chenyang

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Abstract

With the increase of span length of suspension bridges, the static wind action, the aerodynamic load acting on main cables and the spatial non-uniformity of wind speed increase consequently, which may have an unnegligible influence on the flutter stability of long-span suspension bridges.Based on the linear flutter analysis, a refined three-dimensional nonlinear flutter analytical method was presented in which the effects of the static wind action, spatial non-uniformity of wind speed and aerodynamic load acting on main cables were further considered, and the corresponding computational procedure was programmed.By taking Runyang Bridge over the Yangtze River as an example, the effects of the static wind action, wind speed spatial non-uniformity, and cable’s aerodynamic load on the flutter stability of the bridge were investigated numerically by virtue of the refined flutter analysis.The results show that the variations of structural dynamic characteristics and nonlinearity of wind load caused by the static wind action, spatial non-symmetric distribution of wind speed and aerodynamic load acting on main cables have significant influences on the flutter stability of long-span suspension bridges, and therefore should be considered accurately in the flutter analysis.

Key words

long-span suspension bridge / flutter stability / static wind action / wind speed spatial non-uniformity / the aerodynamic load acting on main cables

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ZHANG Xinjun, ZHAO Chenyang. 3D refined flutter analysis of long-span suspension bridges[J]. Journal of Vibration and Shock, 2019, 38(14): 246-253

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