| 悬吊双层闭口箱梁桥面风振性能 |
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| 引用本文： | 李加武,洪光,王俊,王佳盈,王峰,李宇.悬吊双层闭口箱梁桥面风振性能[J].交通运输工程学报,2022,22(6):207-219. |
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| 作者姓名： | 李加武 洪光 王俊 王佳盈 王峰 李宇 |
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| 作者单位： | 1.长安大学 公路学院，陕西 西安 7100642.兰州理工大学 土木工程学院，甘肃 兰州 730050 |
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| 基金项目： | 国家自然科学基金项目51978077陕西省自然科学基础研究计划项目2022JQ-507 |
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| 摘 要： | 以悬吊双层闭口箱梁桥面为研究对象，通过风洞试验，针对结构静力耦合与气动干扰对悬吊双层闭口箱梁桥面风振性能影响进行了研究；采用变分模态分解方法对试验监测信号进行模态分解，识别颤振模态；通过振动形态矢量图与相位图对颤振弯扭耦合程度及弯扭相位差进行分析；根据最小二乘法识别颤振导数，基于激励-反馈原理，由颤振导数识别颤振气动阻尼。研究结果表明:在结构静力耦合与气动干扰共同作用下，下层断面发生软颤振，其竖向、扭转振动参与度系数分别为0.85、0.53，其颤振形态倾向于竖向振动；下层断面在自激气动力作用下发生颤振，自激气动力相位差减小导致颤振弯扭相位差减小为81.29°，而上层断面在结构耦合力作用下发生强迫振动，结构耦合力相位差决定上层断面弯扭相位差为100.81°；下层断面竖向振动气动阻尼主要来源于竖向速度自激升力负阻尼以及弯扭速度通过激励反馈所产生的耦合升力负阻尼，分别为60%和40%；下层断面转振动气动阻尼主要来源于扭转速度自激升力矩正阻尼以及弯扭速度通过激励反馈所产生的耦合升力矩正阻尼，分别为45%和50%。可见，对于悬吊双层闭口箱梁桥面，下层断面在竖向振动气动负阻尼驱动下发生偏于竖向振动形态软颤振，下层断面软颤振诱发悬吊双层桥面振动系统整体发生弯扭耦合软颤振。
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| 关 键 词： | 桥梁工程 双层桥梁 风洞试验 风振性能 结构耦合 气动干扰 软颤振 |
| 收稿时间： | 2022-05-03 |
Wind-induced vibration performance of suspended double-deck closed box girder bridge deck |
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| LI Jia-wu,HONG Guang,WANG Jun,WANG Jia-ying,WANG Feng,LI Yu.Wind-induced vibration performance of suspended double-deck closed box girder bridge deck[J].Journal of Traffic and Transportation Engineering,2022,22(6):207-219. |
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| Authors: | LI Jia-wu HONG Guang WANG Jun WANG Jia-ying WANG Feng LI Yu |
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| Affiliation: | 1.School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China2.School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China |
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| Abstract: | A suspended double-deck closed box girder bridge deck was taken as the research object, and the influences of structural static coupling and aerodynamic interference on the wind-induced vibration performance of the bridge deck were studied through a wind tunnel test. The variational mode decomposition method was used to perform the mode decomposition on experimental monitoring signals and identify flutter modes. A vibration morphology vector diagram and a phase diagram were used to analyze the coupling degree of flutter bending and torsion and the phase difference of the bending and torsion. Flutter derivatives were identified by the least square method, and the aerodynamic damping of the flutter was identified by the flutter derivatives based on the incentive-feedback principle. Research results show that under the joint action of structural static coupling and aerodynamic interference, soft flutter occurs on the lower section, and the vertical and torsional vibration participation coefficients are 0.85 and 0.53, respectively. The flutter morphology tends to be a vertical vibration morphology. The lower section flutters under the action of self-excited aerodynamic force, and the decrease in the phase difference of the self-excited aerodynamic force makes the phase difference of the flutter bending and torsion reduce to 81.29°. However, the upper section performs a forced vibration under the action of a structural coupling force, and the phase difference of the bending and torsion of the upper section is determined to be 100.81° under the influence of the phase difference of the structural coupling force. The aerodynamic damping of the vertical vibration in the lower section mainly comes from the negative damping of a self-excited lift force of vertical velocity and the negative damping of a coupled lift force generated by the bending and torsional velocity through the incentive and feedback, which account for 60% and 40%, respectively. The aerodynamic damping of the torsional vibration in the lower section mainly comes from the positive damping of a self-excited lift force torque of torsional velocity and the positive damping of a coupled lift force torque generated by the bending and torsional velocity through the incentive and feedback, which account for 45% and 50%, respectively. Therefore, for the suspended double-deck closed box girder bridge deck, the soft flutter of the lower section is inclined to the vertical vibration morphology under the aerodynamic negative damping drive of the vertical vibration, and the soft flutter of the lower section induces a soft flutter with a bending-torsional coupling of the vibration system for the suspended double-deck bridge deck. 1 tab, 17 figs, 35 refs. |
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