- ISSN 0258-2724
- CN 51-1277/U
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| Citation: | LEI Yongfu, LI Ming, SUN Yanguo, LI Mingshui. Experimental Study on Flutter Performance of Long-Span Suspension Bridge with Double-Deck Truss Girder[J]. Journal of Southwest Jiaotong University, 2022, 57(6): 1224-1232. doi: 10.3969/j.issn.0258-2724.20200599
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In order to improve the flutter performance of a long-span suspension bridge with a double-deck truss girder, the Yangsigang Yangtze River Bridge with a main span of 1700 m was taken as the engineering prototype to conduct section model wind tunnel tests, to study the effects of the upper central stabilizers, lower stabilizers, horizontal flaps and their combinations on the flutter performance of the bridge girder. Then, the effective aerodynamic measures were combined with the truss girder components to reduce the adverse effects of traditional aerodynamic measures. Finally, for the optimal aerodynamic scheme, the influence of damping ratio on the flutter performance of the optimized bridge girder was investigated. The results show that the single-degree-of-freedom torsional soft flutter with no evident divergent point has occurred to the bridge girder in the original design at attack angles of 0° and +3°, and the corresponding critical flutter wind speeds are 50.5 m/s and 31.2 m/s, respectively. The upper central stabilizers installed on the upper deck, the lower stabilizers installed below the lower deck, and the horizontal flaps installed at the level of the bottom of sidewalk can improve the flutter performance of the double-deck truss girder to varying degrees. The critical flutter wind speed of the main girder can be increased by over 34% by combining the horizontal flaps and lower stabilizers installed at the lower deck. On this basis, an optimal aerodynamic scheme is proposed to broaden the upper bracket and sidewalk plate, and combine the lower stabilizer with the track of the maintenance vehicle. Meanwhile, it is found that the critical flutter wind speed of the main girder can increase by 11.9% when the system torsional damping ratio increases from 0.37% to 0.52%. This indicates that the dampers may be efficient in suppressing the soft flutter of bridges with single-degree-of-freedom torsional vibrations.
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