悬浮隧道支撑锚索在管体运动状态下的动频率与湿模态

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (2) : 271-279.

论文

朱灿，刘炎，易壮鹏

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

ZHU Can, LIU Yan, YI Zhuangpeng

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摘要

悬浮隧道(submerged floating tunnel,SFT)是一种潜力巨大的水下交通结构，其支撑锚索频率、模态的精确获取对识别结构动力性能至关重要。本文提出了一种管体运动状态下求解锚索“动频率”和“湿模态”的新颖方法，将锚索等效为梁或弦建立了四类考虑锚索抗弯刚度、湿重等因素的力学模型。在对运动悬浮隧道结构进行拟静态处理，及通过静平衡时锚索顶张力与该索支撑范围内净浮力相等的原则确定结构基本参数的前提下，研究了管体竖向周期运动过程中锚索动频率与湿模态的分布规律。获取了锚索动频率带及其上限、下限与管体浮重比、锚索倾角、竖向高度及管体运动幅值之间的对应关系与参数敏感区间，得到了锚索湿模态对湿重展向效应、竖向高度等因素的敏感程度，可为进一步深入研究锚索涡振频率锁定、参数振动提供新的处理思路。

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.

关键词

悬浮隧道 / 支撑锚索 / 管体运动 / 动频率 / 湿模态

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朱灿，刘炎，易壮鹏. 悬浮隧道支撑锚索在管体运动状态下的动频率与湿模态[J]. 振动与冲击, 2024, 43(2): 271-279

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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