Abstract：Taking the wide Π-shaped bridge deck as an example, this study systematically studies the VIV performance of this deck and the measures to control its VIV. First, the wind tunnel test was carried out, and it was found that the aerodynamic shape of the original section of this deck was poor, and the amplitude of VIV close to the specification limit occurred under the frequently encountered wind speed. Then, on the basis of previous research, five typical aerodynamic measures were selected, and their VIV control performance was evaluated by wind tunnel test. Comparative analysis of the test results of the five measures, the following four conclusions are drawn:(1) The more downward eccentric the fairing is, the better the vibration suppression effect. (2) The VIV control effect of large-sized fairing is better than that of small-sized one. (3) The edge of the fairing is provided with a horizontal plate facilitates the advance separation of the airflow, thereby improving the vibration suppression performance. (4) For torsional vortex control, the fairing is not as good as the inverted L-shaped edge plate. With the above test conclusions, the original section and the measures with better VIV control effect were selected for CFD simulation, in order to explore the induction and control mechanism of Π-shaped deck VIV. According to the analysis of the simulation results, the main cause of the vortex vibration of the Π-shaped deck is that the airflow separates at the upstream corner of the bridge deck to form a shear layer, and then a large-scale vortex with the size of the bridge deck is formed in the box. The control mechanism of the VIV is to rectify the separated air flow by equipping aerodynamic measures, weaken the shear layer energy, and then improve the VIV performance of the Π-shaped deck. This study has certain guiding significance for the VIV performance of Π-shaped deck, and proposes several effective VIV suppression measures, which provide a basis for the engineering design of similar bridge decks.
宋玉冰，遆子龙，李永乐. 宽幅Π型主梁涡振机理及优化措施研究[J]. 振动与冲击, 2023, 42(10): 121-127.
SONG Yubing，TI Zilong，LI Yongle. Mechanism and aerodynamic optimization of vortex-induced vibration for a wide Π-shaped bridge deck. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(10): 121-127.
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