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Wind and Structures
  Volume 10, Number 6, November 2007 , pages 543-554
DOI: https://doi.org/10.12989/was.2007.10.6.543
 


Experimental studies on possible vortex shedding in a suspension bridge. Part I – Structural dynamic characteristics and analysis model
S. S. Law, Q. S. Yang and Y. L. Fang

 
Abstract
    The suspension bridge is situated in an area of complex topography with both open sea and overland turbulence characteristics, and it is subject to frequent typhoon occurrences. This paper investigates experimentally the possible vortex shedding events of the structure under high wind and typhoon conditions. A single-degree-of-freedom model for the vibration of a unit bridge deck section is adopted to determine the amplitude of vibration and to estimate the parameters related to the lifting force in a vortex shedding event. The results of the studies are presented in a companion paper (Law, et al. 2007). In this paper, statistical analysis on the measured responses of the bridge deck shows that the vibration response at the first torsional mode of the structure has a significant increase at and beyond the critical wind speed for vortex shedding as noted in the wind tunnel tests on a section model of the structure.
 
Key Words
    wind; typhoon; dynamic; vortex shedding; suspension bridge; steel; traffic; model; optimization.
 
Address
S. S. Law; Civil and Structural Engineering Department, Hong Kong Polytechnic University, Hong Kong, People?s Republic of China.
Q. S. Yang; Bridge Engineering Department, Beijing Jiao Tung University, People?s Republic of China.
Y. L. Fang; Mechanical Engineering Department, Tai Yuen University, People?s Republic of China.
 

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