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Wind and Structures
  Volume 13, Number 5, September 2010 , pages 471-485
DOI: https://doi.org/10.12989/was.2010.13.5.471
 


Study of structural parameters on the aerodynamic stability of three-tower suspension bridge
Xin-Jun Zhang

 
Abstract
    In comparison with the common two-tower suspension bridge, due to the lack of effective longitudinal restraint of the center tower, the three-tower suspension bridge becomes a structural system with greater flexibility, and more susceptible to the wind action. By taking a three-tower suspension bridge-the Taizhou Bridge over the Yangtze River with two main spans of 1080 m as example, effects of structural parameters including the cable sag to span ratio, the side to main span ratio, the deck bearing system, longitudinal structural form of the center tower and the cable system on the aerodynamic stability of the bridge are investigated numerically by 3D nonlinear aerodynamic stability analysis, the favorable structural system of three-tower suspension bridge with good wind stability is discussed. The results show that good aerodynamic stability can be obtained for three-tower suspension bridge as the cable sag to span ratio is assumed ranging from 1/10 to 1/11, the central buckle are provided between main cables and the deck at midpoint of main spans, the longitudinal bending stiffness of the center tower is strengthened, and the spatial cable system or double cable system is employed.
 
Key Words
    three-tower suspension bridge; aerodynamic stability; structural parameters.
 
Address
College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310032, P.R. China
 

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