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6 (2) 2016

Multi modes coupling galloping of slender structures


Author - Affiliation:
Nguyen Huy Cung - Industrial University of Ho Chi Minh City , Vietnam
Do Cao Phan - Industrial University of Ho Chi Minh City , Vietnam
Le Van Hung - Industrial University of Ho Chi Minh City , Vietnam
Huynh Le Em - Industrial University of Ho Chi Minh City , Vietnam
Corresponding author: Nguyen Huy Cung - nguyenhuycung@iuh.edu.vn

Abstract
The paper presents a general theoretical framework for galloping analysis of slender structures, taking into account the coupling among modes, the modes shapes, and the variation along the structure of mass per unit length and mean wind velocity. The theory is then applied to a real structure. In the galloping analysis, aerodynamic coefficients are obtained from wind tunnel tests. The results of the analysis show crucial points different from conventional analysis.

Keywords
Aeroelasticity; Aerodynamics; wind-induced instability;wind tunnel tests

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References

DICAT (2010). Dynamic analysis of “Megaframe” of the Building in Varesine – Milan under wind actions. Technical report (in Italian).


Glauert, H. (1919). The rotation of an aerofoil about a fixed axis. British Advisory Committee for Aeronautics (ARC) R & M No. 595. Technical Report of ARC for 1918–1919, 443-447.


Hartog J.P.D., (1932). Transmission-line vibration due to sleet. Institute of Electrical Engineers, 51, 1074–1086.


Macdonald and Larose (2006). A unified approach to aerodynamic damping and drag/lift instabilities, and its application to dry inclined cable galloping. Journal of Fluids and Structures, 22(2), 229-252.


Meirovitch L., (1986). Elements of vibration analysis (2nd edition), McGraw-Hill.


Nguyen, C.H, 2013. Aerodynamic and aeroelastic analysis of complex structures. PhD Thesis. University of Genoa, Genoa, Italy.


Nguyen, C.H., Freda, A., Solari, G. and Tubino, F. (2015). Aeroelastic instability and wind-excited response of complex lighting poles and antenna masts. Eng. Struct., 85, 264-276.



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