scholarly journals Dynamic Response of a Cat Head Type Transmission Tower-line System under Strong Wind

2021 ◽  
Vol 1986 (1) ◽  
pp. 012098
Author(s):  
Chuan Wu ◽  
Xiaohui Yang ◽  
Bo Zhang ◽  
Zehui Liu ◽  
Yang Zhao
Keyword(s):  
Dynamic Response ◽  
Strong Wind ◽  
Transmission Tower ◽  
Line System ◽  
Head Type

Wind-Induced Progressive Collapsed Performance of Cup-Type Transmission Tower-Line System

2013 ◽  
Vol 353-356 ◽  
pp. 2392-2396
Author(s):  
Zhuo Qun Zhang ◽  
You Xin Lin ◽  
Hong Nan Li
Keyword(s):  
Progressive Collapse ◽  
Finite Element Models ◽  
Strong Wind ◽  
Transmission Tower ◽  
Line System ◽  
System Collapse ◽  
Simulation Results ◽  
Element Technique ◽  
Simulated Wind ◽  
Collapse Process

The Cup-type transmission tower-line system was a classic representative of high voltage electric power carrier, which was an important lifeline project. However, it frequently collapsed under different environmental loadings, especially strong wind. In this work, four tower five line finite element models simulated wind-induced progressive collapse process by birth-to-death element technique in ABAQUS/Explicit. The numerical simulation results demonstrated that this application could describe the structural collapse performance clearly and effectively and transmission tower-line system collapse path depended on the number, position and last deformation of damage elements.

Dynamic Response of Conductor Breakage for Oxytropis Transmission Tower-Line System

2010 ◽  
Vol 43 ◽  
pp. 165-168
Author(s):  
Ran Li ◽  
Qiang Gao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Response ◽  
Transient Analysis ◽  
Transmission Tower ◽  
Dynamic Tension ◽  
Initial Tension ◽  
Line System ◽  
System Vibration ◽  
Peak Value

Dynamic response of conductor breakage is analyzed on guyed oxytropis transmission tower-line system of 500KV 5291 JinJiang-Zhenjiang lines. Considering unbalanced tension, finite element method is presented. Result of the transient analysis shows that the vibration of tower-line system happens after conductor breakage. With the damping affect，the system vibration becomes gentle. For the tension of lines, the peak value of dynamic tension of conductor can be times of the initial tension. It is shown that the proposed method is of efficiency and practicality.

CONTROL OF WIND-INDUCED RESPONSE OF TRANSMISSION TOWER-LINE SYSTEM BY USING MAGNETORHEOLOGICAL DAMPERS

2009 ◽  
Vol 09 (04) ◽  
pp. 661-685 ◽  
Author(s):  
BO CHEN ◽  
JIN ZHENG ◽  
WEILIAN QU
Keyword(s):  
Active Control ◽  
Passive Control ◽  
Control Strategies ◽  
Wind Loading ◽  
Induced Response ◽  
Strong Wind ◽  
Transmission Tower ◽  
Line System ◽  
Control Approach ◽  
Mr Dampers

Transmission tower-line system is a high-rise structure with low damping and it is therefore prone to strong wind excitation. In this paper, the control of wind-induced response of transmission tower-line system is carried out by using magnetorheological (MR) dampers. The effects of brace stiffness of damper are introduced and a multi-degree-of-freedom (MDOF) model is developed for both in-plane/out-of-plane vibration of transmission tower-line system. Two semi-active control strategies are proposed for the vibration mitigation of tower-line system. The first one is based on fixed increment of controllable damper force whereas the second one is a clipped-optimal strategy based on fuzzy control principle. The optimal parameters of the MDOF model of transmission line are investigated. A real transmission tower-line system constructed in China is taken as an example to examine the feasibility and reliability of the proposed approach. A parametric study is conducted for the effects of brace stiffness of MR damper, wind loading intensity, and parameters of MR fluids on the control performance. The results demonstrate that the incorporation of MR dampers into the transmission tower-line system can substantially suppress the wind-induced responses of transmission tower if the damper parameters are optimally determined. The performance of the two kinds of semi-active control approaches is better than that of a passive control approach.

Finite Element Analysis for the Collapse Accident of One 110kV Transmission Tower

2013 ◽  
Vol 690-693 ◽  
pp. 1940-1944
Author(s):  
Ming Jian Jian ◽  
Du Qing Zhang ◽  
Guang Cheng Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Transmission Line ◽  
Element Model ◽  
Strong Wind ◽  
Transmission Tower ◽  
Element Analysis ◽  
Line System ◽  
Buckling Instability

One collapse tower of 110 kV transmission line was taken as an example and a finite element model for the coupled tower-line system was established for investigating the effects of the strong wind on the transmission tower and line. The result shows that the selected standard of material of some rod members is lower, and the area of their section is relatively small. Main legs present buckling instability because of being in compression under action of the strong wind, which leads to the collapse accident of the towers.

Seismic Performance Analysis of Transmission Tower System Based on MATLAB Numerical Calculation

2012 ◽  
Vol 446-449 ◽  
pp. 43-48
Author(s):  
Zhi Xiang Cao ◽  
Xiu Li Cao
Keyword(s):  
Numerical Calculation ◽  
Dynamic Response ◽  
Axial Force ◽  
System Dynamic ◽  
Seismic Load ◽  
System Quality ◽  
Transmission Tower ◽  
Line System ◽  
Amplification Effect ◽  
Numerical Calculation Method

Transmission tower line system dynamic response and failure mechanism are very complex under seismic load, the dynamic response and cooperation mechanism of the upper structure, pile and soil of transmission tower line system under seismic load based on the MATLAB numerical calculation method in this paper, and the displacement, acceleration velocity and displacement of axial force distribution of different positions of transmission tower line system are calculated by building transmission tower line of the stiffness matrix, equivalent load node, system quality matrix, motion equation and the upper structure of whole pile of model and with the help of the solution of the MATLAB function. The numerical calculation results show that the soil-consider the upper structure of pile-coordination effects for displacement and acceleration amplification effect are obvious, but the truss of axial force amplification effect is relatively small. Meanwhile, the earthquake action soil pile-between the upper structure are strong dynamic interaction, which provides certain theoretical guidance for recognizing transmission tower line system dynamic response mechanism under earthquake and adopting efficient anti-seismic measures.

scholarly journals Statistical Analysis of Wind-Induced Dynamic Response of Power Towers and Four-Circuit Transmission Tower-Line System

2018 ◽  
Vol 2018 ◽  
pp. 1-18
Author(s):  
Xiaolei Zhang ◽  
Yanzhong Ju ◽  
Fuwang Wang
Keyword(s):  
Statistical Analysis ◽  
Wind Speed ◽  
Dynamic Response ◽  
Wind Field ◽  
Coherence Function ◽  
Time History ◽  
Transmission Tower ◽  
Statistical Parameters ◽  
Line System ◽  
Axial Forces

Only one wind field model loading the transmission tower or the tower-line system was investigated in the previous studies, while the influence of two different wind field models was not considered. In addition, only one sample of the wind speed random process was used in the past numerical simulations, and the multiple dynamic response statistical analysis should be carried out. In this paper, statistical analysis of the wind-induced dynamic response of single towers and the transmission tower-line system is performed with the improved accuracy. A finite element model of the transmission tower-line system (the tower consisted of both steel tubes and angel steels) is established by ANSYS software. The analysis was performed by three statistical methods. The effects of the length of the time history and of the number of samples were investigated. The frequency histograms of samples follow the Gaussian distribution. The characteristic statistical parameters of samples were random. The displacements and the axial forces of the low tower are larger than those of the high tower. Two wind field models were applied to simulate the wind speed time history. In field 1 model, Davenport wind speed spectrum and Shiotani coherence function were applied, while in field 2 model Kaimal wind speed spectrum and Davenport coherence function were used. The results indicate that wind field 1 is calmer than wind field 2. The displacements and the axial forces of the tower-line system are less than those of single towers, which indicate damping of wind-induced vibrations by the transmission line. An extended dynamic response statistical analysis should be carried out for the transmission tower-line system.

SEISMIC RESPONSE OF POWER TRANSMISSION TOWER-LINE SYSTEM UNDER MULTI-COMPONENT MULTI-SUPPORT EXCITATIONS

2012 ◽  
Vol 06 (04) ◽  
pp. 1250025 ◽  
Author(s):  
TIAN LI ◽  
LI HONGNAN ◽  
LIU GUOHUAN
Keyword(s):  
Seismic Waves ◽  
Power Transmission ◽  
Incident Angle ◽  
Ground Motions ◽  
Three Dimensional ◽  
Transmission Tower ◽  
Line System ◽  
Time Stepping ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The effect of multi-component multi-support excitations on the response of power transmission tower-line system is analyzed in this paper, using three-dimensional finite element time-stepping analysis of a transmission tower-line system based on an actual project. Multi-component multi-support earthquake input waves are generated based on the Code for Design of Seismic of Electrical Installations. Geometric non-linearity was considered in the analysis. An extensive parametric study was conducted to investigate the behavior of the transmission tower-line system under multi-component multi-support seismic excitations. The parameters include single-component multi-support ground motions, multi-component multi-support ground motions, the correlations among the three-component of multi-component multi-support ground motions, the spatial correlation of multi-component multi-support ground motions, the incident angle of multi-component multi-support seismic waves, the ratio of the peak values of the three-component of multi-component multi-support ground motions, and site condition with apparent wave velocity of multi-component multi-support ground motions.

Finite Element Analysis for the Collapse Accident of a 110kV Transmission Tower

2014 ◽  
Vol 986-987 ◽  
pp. 927-930
Author(s):  
Yi Zhu ◽  
Bo Li ◽  
Hao Wang ◽  
Kun Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cross Section ◽  
Strong Wind ◽  
Transmission Tower ◽  
Element Analysis ◽  
Straight Line ◽  
The Finite Element Analysis

Put the finite element analysis of line tower coupling modeling to the collapse of a 110 kV line straight-line tower, study the effect of strong wind on transmission tower and wire. The results show that under the action of strong wind, the material specification selected by the part of the rods on the type of tower is lower, cross section is smaller, the principal material of tower will be instable and flexional under the compression, resulting in tower collapsed.

Sign in / Sign up

Export Citation Format

Share Document