- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | YANG Meng, WANG Yunfei, ZHAO Jiabin, ZHOU Jing, WANG Yongjing, LI Yongle. Vortex-Induced Vibration Response of Bridges Considering Both Spanwise Variation of Vibration Amplitude and Correlation of Aerodynamic Forces[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20220714
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This paper aims to study the effect of spanwise variation of vibration amplitude and spanwise correlation of the nonlinear aerodynamic forces on the vortex-induced vibration (VIV) response of bridges. Firstly, a nonlinear aerodynamic force model of the bridge represented by polynomial functions of vibration amplitude was introduced. Secondly, on the basis of the two-dimensional VIV (2D VIV) analysis method, an approach for predicting the three-dimensional VIV (3D VIV) amplitude response with consideration of both spanwise variation of vibration amplitude and spanwise correlation of aerodynamic forces was proposed through theoretical analysis. Finally, by taking a 1 700 m long-span suspension bridge as an example, the nonlinear aerodynamic force parameters of vertical VIV of the bridge girder at different angles of wind attack were extracted through a wind tunnel test. Then, the VIV amplitude response of the suspension bridge under a first-order positive symmetrical vertical mode at different angles of wind attack was analyzed. The results prove that when the aerodynamic forces are assumed to be fully correlated along the span, the 3D analysis under different wind speeds leads to a significantly higher VIV amplitude response (about 19%) as compared with the 2D analysis method due to the effect of spanwise variation of vibration amplitude of the aerodynamic forces. However, when the aerodynamic forces are assumed to be partially correlated along the span, the VIV amplitude response by 3D analysis is reduced significantly, and the reduction range is about 16%–30% under most wind speeds and about 70% under certain wind speeds. It is proved that it is important to accurately predict the VIV amplitude response of long-span bridges by considering the spanwise variation of vibration amplitude and spanwise partial correlation of aerodynamic forces. The approach proposed in this paper is also applicable to the analysis of torsional VIV or VIV at higher-order modes.
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