Dynamic frequency and wet mode of the supporting cables of a submerged floating tunnel in tube motion state

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (2) : 271-279.

ZHU Can, LIU Yan, YI Zhuangpeng

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Abstract

The submerged floating tunnel (SFT) is a kind of underwater traffic structure with great potential. The accurate acquisition of the frequency and mode of its supporting cables is crucial to identify the dynamic performance of this structure. In this paper, a novel method is proposed to obtain the "dynamic frequency" and "wet mode" of the supporting cables under the tube motion. Four types of mechanical models are established by equating the cable as a beam or string, taking into accounts the bending stiffness, wet-weight and other factors of the cables. On the premise of quasi-static treatment of the moving SFT and determination of the basic parameters of the structure by the principle that the top tension of the supporting cable is equal to the net buoyancy within the support range of the cable during static equilibrium, the distribution law of the dynamic frequency and wet mode of the cable during the vertical periodic motion of tube is studied. The corresponding relationships, as well as the parameter sensitive interval, between the dynamic frequency band of the cable and its upper/lower limits and the tube’s buoyancy weight ratio (BWR), the cable’s inclination angle, the cable’s vertical height and the amplitude of the tube motion are determined. The sensitivities of the wet mode to the span effect of wet-weight, the vertical height and other factors are obtained. This method provides a new treatment idea for further in-depth research on the frequency locking of the vortex-induced vibration and parametric vibration for the cable of SFT.

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ZHU Can, LIU Yan, YI Zhuangpeng. Dynamic frequency and wet mode of the supporting cables of a submerged floating tunnel in tube motion state[J]. Journal of Vibration and Shock, 2024, 43(2): 271-279

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