Structural Engineering and Mechanics

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Vortex induced vibration and its controlling of long span Cross-Rope Suspension transmission line with tension insulator

  • Tu, Xi (Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Ministry of Education) ;
  • Wu, Ye (Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Ministry of Education) ;
  • Li, Zhengliang (Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Ministry of Education) ;
  • Wang, Zhisong (Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Ministry of Education)
  • Received : 2020.08.05
  • Accepted : 2021.02.19
  • Published : 2021.04.10
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Abstract

Long span cross-rope suspension structure is an innovative structural system evolved from typical Cross-Rope Suspension (CRS) guyed tower, a type of supporting system with short span suspension cable supporting overhead power transmission lines. In mountainous areas, the span length of suspension cable was designed to be extended to hundreds or over one thousand meters, which is applicable for crossing deep valleys. Vortex Induced Vibration (VIV) of overhead power transmission lines was considered to be one of the major factors of its fatigue and service life. In this paper, VIV and its controlling by Stockbridge damper for long span CRS was discussed. Firstly, energy balance method and finite element method for assessing VIV of CRS were presented. An approach of establishing FE model of long span CRS structure with dampers was introduced. The effect of Stockbridge damper for overall vibration of CRS was compared in both theoretical and numerical approaches. Results indicated that vibration characteristics of conductor in long span CRS compared with traditional tower-line system. Secondly, analysis on long span CRS including Stockbridge damper showed additional dampers installed were essential for controlling maximum dynamic bending stresses of conductors at both ends. Moreover, factors, including configuration and mass of Stockbridge damper, span length of suspension cable and conductor and number of spans of conductor, were assessed for further discussion on VIV controlling of long span CRS.

Keywords

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