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| Spatial correlation of vortex-induced pressure of a square prism section model |
| ZHU Ledong 1,2,3 CHEN Xiuyu 1,2 |
1.State Key Laboratory of Disaster Reduction in Civil Engineering，Tongji University，Shanghai 200092，China；
2. College of Civil Engineering，Tongji University，Shanghai 200092，China；
3. Key Laboratory of Wind Resistance Technology of Bridges of Ministry of Transport，Tongji University，Shanghai 200092，China |
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Abstract Vortex-induced vibration is a kind of wind-induced nonlinear self-limiting vibration with both forced and self-excited characteristics.Current research on vortex-induced vibration is mostly confined to the two-dimensional nonlinear mathematical model of vortex-induced force, and the span-wise correlation research is relatively less.In this paper, the square prismatic section model was used in the fixed and spring suspended wind tunnel test to analyze the span-wise correlation and chord-wise correlation of vortex-induced pressure in the static condition and vortex-induced resonance two cases.It was found that the span-wise correlation of the vortex-induced pressure is good when in resonance, it decays along the bridge span and is significantly increased with the amplitude.The correlation is much worse in static condition, the correlation coefficient decreases close to 0 with the increase of the span-wise distance.The correlation rule of vortex-induced pressure varies a lot in different points.
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Received: 27 July 2017
Published: 15 April 2019
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