Abstract：Cablestayed bridges have complex internal resonance characteristics. In the past, multiple internal resonances were studied usually based on the multiple relationships of frequencyies, while the modal coupling process was neglected. In order to study the multiple internal resonances and the coupling process between different modes, a nonlinear dynamic model test of a cablestayed bridge was carried out. It is found that when the external excitation frequency is about twice of the natural frequency of the longcable, “beat vibration” of the cable could be induced, and the sum of the two “beat frequencies” is exactly equal to the external excitation frequency. The coupling process between different modes was studied by using the method of subsection analysis and zerophaseshift filtering. The results show that: the cablestayed bridge’s nonlinear modal frequency is lower than the linear modal frequency； multiple internal resonances need to experience a certain time of coupling to induce the steady large amplitude vibration of the cablestayed bridge； the simultaweous occurance of forced vibration, localhybrid coupling vibration and combined internal resonance is the fundamental reason for the cable’s “beat vibration” induced by a single frequency excitation with the excitation frequency equal to the sum of the two “beat frequencies”.
收稿日期: 2017-05-23
出版日期: 2018-05-15
引用本文:
孙测世 1,赵珧冰 2，康厚军 3，赵跃宇 3. 斜拉桥的多重内共振及其耦合过程研究[J]. 振动与冲击, 2018, 37(10): 87-93.
SUN Ceshi 1 ZHAO Yaobing 2 KANG Houjun 3 ZHAO Yueyu 3. Multiple internal resonances and coupling process of cablestayed bridge. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(10): 87-93.
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