Abstract
This paper investigated the aerodynamic response features of an asymmetric cable-stayed bridge. The wind resistance design parameters for judging the response were first determined, afterwards the bridge dynamic characteristics were analyzed for subsequent aerodynamic analysis. The vortex-induced vibrations (VIV) and flutter response at various wind fairing angles were then examined by using a 1:50 sectional model in the wind tunnel test. Finally, a 1:150 full bridge aeroelastic model was employed to explore the aerodynamic stability and characteristics of the whole asymmetric bridge under different wind attack angles in various flow fields. The results show that the sharp wind fairings could reduce the VIV amplitude of the steel box girder cable-stayed bridge to some extent, and the example bridge has examined to have enough flutter stability through sectional and full bridge aeroelastic model wind tunnel tests. Unlike symmetric bridges, the bridge’s maximum displacement of first torsion mode shape is at the closure rather than the mid-span, which is the essential reason to lead this unique vibration feature. The results from the present study could highlight the important effect of structural asymmetry and fairing shape to the wind-induced bridge vibration and hence may facilitate more appropriate wind design of asymmetric cable-stayed bridges.
Highlights
Various wind-induced vibration may occur in a long-span cable-stayed bridge, such as the vortex-induced vibration at low-speed wind [1,2,3,4,5], the buffeting response induced by the turbulence inherent in natural wind at strong wind [6], and the flutter instability due to the self-excited forces resulting from wind-bridge interaction
Because bridge vortex-induced vibrations (VIV) is generally symbolized by single-mode harmonic vibration, the displacement response of VIV can be approximately represented by a sine or cosine function
The vortex energy created by the sharper wind fairing under the influence of the incoming flow is smaller and has a higher frequency
Summary
Various wind-induced vibration may occur in a long-span cable-stayed bridge, such as the vortex-induced vibration at low-speed wind [1,2,3,4,5], the buffeting response induced by the turbulence inherent in natural wind at strong wind [6], and the flutter instability due to the self-excited forces resulting from wind-bridge interaction. In spite of their vulnerability, the cable-stayed bridge continues to be built by virtue of their larger span and beautiful appearance. Numerous researchers have presented analysis theories and prediction methods for VIV [7,8,9,10,11], buffeting [12,13], and flutter [14,15,16,17], the wind tunnel test would still be the most important and indispensable approach for evaluating the wind-resistant performance and exploring the countermeasures of final alternatives of long-span bridges [6,18,19]
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