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| Experimental study on in-plane nonlinear vibration of a cable-stayed bridge subjected to a hamonic excitation |
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Abstract The vibration problem of cable-stayed bridge cables has always been a research hotspot in the field of bridge engineering. In order to reveal mechanical mechanism of the large vibration of cables, our group established a full-bridge refined model of cable-stayed bridge. The possible nonlinear vibration behaviors of cable-stayed bridges under single-frequency excitation are studied in the paper. Firstly, modal parameters of this model are examined by free vibration test, which is compared with two types of finite element models (OECS model and MECS model). The results are in good agreement with each other. Secondly, the non-linear response of cable-stayed bridge model under a single vertical harmonic excitation is studied. The research shows that when the excitation frequency is close to the global modal frequency of the cable-stayed bridge, the phenomenon of primary resonance is observed on the beam, which causes great amplitude parametric and forced vibrations of some long cables; when the ratio of excitation frequency to the first-order in-plane frequency of the cable is 1:2 or 2:1, the Superharmonic resonance or Subharmonic resonance phenomenon have also been observed in the cable.
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Received: 28 January 2019
Published: 20 June 2019
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| Fund:Theoretical and experimental study on nonlinear dynamic model and characteristics of long-span CFRP cable-stayed bridge |
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2019, Vol. 40 
