Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (4): 53-58.

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Effect of Aerodynamic Coupling Among Modes on Buffeting Redponse of Bridges

zeng Xian-wu  Han Da-jian   

  1. Dept.of Civil Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2004-01-12 Online:2005-04-25 Published:2005-04-25
  • Contact: Zeng Xian—wu(born in 1977)．male，Ph．D．candidate，mainly researches on wind and earthquake resis tance and its control of long—span bridges E-mail:xw.zeng@163.com
  • About author:Zeng Xian—wu(born in 1977)．male，Ph．D．candidate，mainly researches on wind and earthquake resis tance and its control of long—span bridges

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Abstract:

The bufeting analysis of bridges has traditionally been accomplished by the single-mode-based SRSS (Square Root of the Sum of the Squares)method.As the main spans of bridges become longer and Ionger,the efect of the aerodynamic coupling among modes becomes so significant that it should not be neglected any more.In this paper,ten transfer functions are defined to further investigate the efect of the aerodynamic coupiing among mod es by analyzing the variation of the transfer functions with wind velocity. This investigati0n is based on the multimod e buffeting analysis procedure proposed by Scanlan. A torsional coupling ystem with 2 degrees of freedom is used as the object,and the characteristics and mechanism of the aerodynamic coupling are discussed.

Key words: long span bridge, muhimode coupled buffeting, frequency domain, aerodynamic coupling, trans-fer , function