Experimental study on in-plane nonlinear vibrations of the cable-stayed bridge
Experimental study on in-plane nonlinear vibrations of the cable-stayed bridge
复制标题
斜拉桥面内非线性振动试验研究
DOI：
10.1007/s11071-019-05259-0
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发表时间：
2019
影响因子：
5.6
通讯作者：
Yueyu Zhao
中科院分区：
文献类型：
--
作者：
Xiaoyang Su;Houjun Kang;Jiefu Chen;Tieding Guo;Ceshi Sun;Yueyu Zhao
斜拉桥的非线性动力特性是一个相当复杂而又十分有趣的问题。为了研究斜拉桥的非线性特性，以象山港大桥为原型，建立了缩尺物理模型，并进行了系统的试验研究。首先，通过拉索自振试验测量了拉索的物理参数，特别是初拉力，并对数据进行了FFT和滤波处理。并进行了相应的模态分析，试验结果与OECS模型和MECS模型的结果吻合较好，表明了试验的有效性。然后，分析了拉索的自由振动，揭示了不同拉索之间的1：1共振。在此基础上，通过对斜拉桥主梁施加单一激励，研究了斜拉桥的非线性共振，观察到了参数振动、谐共振、多重内共振、主共振和索-索耦合振动等丰富的非线性现象。最后得出了一些有趣的结论，例如，当非线性共振条件匹配时，在外部激励下，可以诱发拉索的大幅振动。
The nonlinear dynamic behaviors of the cable-stayed bridge are considerably complicated and very interesting. In order to explore the nonlinear behaviors of a cable-stayed bridge, a scaled physical model with Xiangshangang Bridge as the prototype is established and the systematical experiments are carried out. Firstly, the physical parameters, especially initial tension forces, of cables are measured by free vibration test and the data is dealt with FFT and filtering technology. The corresponding modal analysis is conducted and the test results are in good agreement with those obtained by OECS model and MECS model, which shows the experimental effectivity. Then, the free vibrations of cables are analyzed and the 1:1 resonance between different cables is revealed. Thereafter, by applying a single excitation to the beam, the nonlinear resonance of the cable-stayed bridge is studied and the rich nonlinear phenomena are observed, such as the parametric vibration, harmonic resonance, multiple internal resonance, primary resonance and cable–cable coupling vibration. Finally, some interesting conclusions are drawn, for example, the large amplitude vibrations of cables can be induced when the nonlinear resonance conditions are matched under external excitation.