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Parametric studies on relationships between flutter derivatives of slender bridge(Ⅱ)

Applied Mathematics and Mechanics(English Edition) 2009年第2期30卷 335-341页

作者：徐旭 Wei-zang CHIEN Department of Civil Engineering Shanghai University Shanghai 200072 P. R. China 不详

Based on curve fitting of coefficients of three component forces of the Messina Straits Bridge, and the previously proposed semi-analytical expressions of flutter derivatives of flexible structure, the change of flutter derivatives of slender bridge cross-section with respect to its aerodynamic center, rotational speed and angle variation is studied using a parametric method. The calculated results are compared with the measured ones, and expressions of flutter derivatives of the Messina Straits Bridge are derived. The intrinsic relationships existing in flutter derivatives are validated again. It is shown that the influence of the rotational speed on flutter derivatives is not negligible. Therefore, it provides an additional semi-analytical approach for analyzing flutter derivatives of the bridge with streamlined cross-section to get its aerodynamic information.

关键词： flutter derivative slender bridge parametric analysis

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Comparisons of bridges flutter derivatives and generalized ones

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Frontiers of Structural and Civil Engineering 2009年第3期3卷 272-278页

作者： Fuyou XU Airong CHEN Zhe ZHANG Cailiang HUANG School of Civil&Hydraulic Engineering Dalian University of TechnologyDalian 116024China Department of Bridge Engineering Tongji UniversityShanghai 200092China

The causes of the nonlinearity of self-excited aerodynamic force of bridge are interpreted from such two aspects as amplitude and wind *** concept of"generalized flutter derivative"is proposed,and its physical meaning is *** graphs of the general-ized flutter derivatives of plate and Sutong Bridge section model are *** characteristics of all generalized flutter derivatives are compared and analyzed,and their superiorities are *** results indicate that the physical meaning of generalized flutter derivatives are more explicit compared to the traditional *** is more convenient to understand the nonlinearity properties of self-excited aerodynamic force of bridge according to the generalized flutter derivatives graphs with the wind velocity as the horizontal coordinate.

关键词： bridge flutter derivative generalized flutter derivative self-excited aerodynamic force Sutong Bridge

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