|Table of Contents|

Analysis of dynamic characteristics of transmission tower-suspension holding rod coupling system under construction(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年01期
Page:
121-130
Research Field:
建筑结构
Publishing date:

Info

Title:
Analysis of dynamic characteristics of transmission tower-suspension holding rod coupling system under construction
Author(s):
LIU Xiaofan1;  LIN Yuxuan2;  LIU Zhiwei1;  SONG Zijian1;  WANG Hao2;  XU Zidong2
(1. State Gird Jiangsu Electric Power Engineering Consulting Co., Ltd., Nanjing 210003, Jiangsu, China; 2. Key Laboratory of C&PC Structures of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China)
Keywords:
transmission tower;  suspension holding rod;  dynamic characteristic;  modal analysis
PACS:
TU351
DOI:
10.19815/j.jace.2023.03060
Abstract:
In order to clarify the dynamic characteristics of transmission tower-suspension holding rod coupling system under construction, the construction of a 500 kV double-circuit linear tower in Jiangsu Province was taken as the engineering background, and ANSYS software was used to carry out finite element three-dimensional modeling of the independent internal suspension external tie holding rod, independent transmission tower and the transmission tower-suspension holding rod coupling system structure under construction respectively. Block Lanczos method was used to calculate the dynamic characteristics of the modal analysis, and the first 20 order vibration patterns and frequencies of the three models were extracted for comparison and analysis. The results show that the low-frequency vibration of the independent model of internal suspension external tie holding rod is mainly orthogonal oscillation, first-order torsion and first-order bending, which is consistent with the special restraint mode and force transmission system of suspension rod. In the transmission tower-suspension holding rod coupling system, due to the poor stability of suspension holding rod, the modalities of the 1st-5th order of the coupling system are the independent vibration of suspension holding rod. From the 6th order, the local vibration pattern of the transmission tower pole and the coupled vibration pattern of the overall swing and local member vibration appear. The first five-order vibration pattern of the holding rod in the transmission tower-suspension holding rod coupling system under construction is the same as that of the independent holding rod modal analysis, but the vibration frequency is reduced, so considering the coupling effect will reduce the modal frequency of the inner suspension external tie holding rod to a certain extent. This research results clarifies the dynamic characteristics of the tower-holding rod coupling system in different construction stages, which has some reference significance to the design of the reinforcement scheme in actual construction.

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Last Update: 2025-01-20