Full-Scale Tests and Numerical Simulations of Failure Mechanism of Power Transmission Towers

Tian, Li; Guo, Liyan; Ma, Ren; Gai, Xia; Wen-ming, Wang

doi:10.1142/s0219455418501092

Cited by 36 publications

(12 citation statements)

References 12 publications

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“…In real collapse events of transmission towers, most failures began in the middle of the tower body or tower leg, and the connection between the cage and tower body is also a crucial position. [20,39,40] 5.1 | Influence of wind attack angle For a real tower structure, the wind may approach from any direction; thus, the wind attack angle can be expected to change with the wind direction. Different wind attack angles can lead to different load distributions in the two horizontal directions, which will result in different responses.…”

Section: Figure 17mentioning

confidence: 99%

Failure analysis of a transmission tower subjected to combined wind and rainfall excitations

Wang

2019

Structural Design Tall Build

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Summary Many transmission towers have collapsed during severe gales and thunderstorms, and these failures have traditionally been attributed simply to wind loading. This study attempts to reveal the full failure mechanism of tower structures under strong wind excitation considering the rainfall effect. First, the calculation of rain load for a tower‐line system is provided. Then, an uncertainty analytical method for estimating the strength capacity and predicting the failure pattern of transmission towers induced by wind and rain loads is presented. Next, a real collapsed transmission line is considered to establish the finite element model, followed by the determination of the most vulnerable tower, which is then used to perform the uncertainty analysis. The results illustrate that the collapse basic wind speed considering the rainfall effect is smaller than the pure wind condition. In addition, the failure probability of the tower body is the largest, which is consistent with the deterministic method, whereas the most vulnerable tower began to fail from the tower leg in reality, indicating that the initial broken position of the transmission tower may not occur in the location with the largest probability and that the deterministic method is invalid in some cases. Finally, the influence of the wind attack angle and bundle number of transmission conductor is investigated. The most unfavorable wind attack angle is 90°, and the rainfall effect becomes increasingly significant with increases in the bundle number; this relationship should be given particular attention.

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Section: Figure 17mentioning

confidence: 99%

Failure analysis of a transmission tower subjected to combined wind and rainfall excitations

Wang

2019

Structural Design Tall Build

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“…For the indispensable dependence on electricity in modern society, transmission networks must cover many regions [4]. The ultimate tested capacity is crucial to power transmission systems that is recognized in society as lifeline construction [5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Seismic Performance of Steel Lattice Transmission Towers

Albayrak

Morshid

2020

Civ Eng J

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The electricity transmission systems are an important lifeline for modern societies. They are used for overhead power lines as supporting structures. Transmission towers are designed to meet electrical and structural requirements. They are designed according to the weight of conductors and environmental effects such as wind and ice loads. They also considered other extraordinary stresses such as cable breakage and ice-breaking effects. Because of a common perception that transmission line (TL) towers show low sensitivity to earthquakes, the effects of the earthquake in TL tower construction are not considered. For this reason, TL towers are investigated with regard to the seismic performance in this study. The principal objectives of this research are: i) to assess the sensitivity of typical TL towers to earthquake loads, ii) to retrofit an existing steel lattice tower using a new section Centre To Center (CTC). In this study, a finite element model of a representative 154 KV transmission tower in Turkey was performed using a set of 10 recorded earthquake ground movements. The four-legged square TL tower has been analyzed and designed for Turkey, Eskisehir seismic zone considering 42.95 m height using finite element (FE) software. Therefore, a new section Centre To Center (CTC) type has been designed and the failed sections have been replaced with a designed section using the SAP2000 section designer. The results show that the load of failure increased after retrofitting. The retrofitting method was effective and easily conducted in fields. Doi: 10.28991/cej-2020-03091600 Full Text: PDF

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“…e result identifies the unfavorable combinations of wind loads that lead to tower collapse. Other tower-line wind studies include stability analysis of strong wind in coastal areas [48,49], nonlinear inelastic analysis under turbulent winds [50], wind tunnel test on aero-elastic model [51], and full-scale numerical simulations of failure mechanism under extreme winds [52,53], among others. However, those studies only studied the effect of wind, rain, or ice on the PTL system without incorporating other equipment like the PTLIRs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Aerodynamic Stability of a Lightweight Dual‐Arm Power Transmission Line Inspection Robot under the Influence of Wind

Alhassan

Zhang

Shen

et al. 2019

Mathematical Problems in Engineering

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To efficiently transmit electric power to consumers, the power lines need to be inspected routinely for early fault detection. Thus, power line inspection robots are designed to replace the tedious and dangerous manual inspection using linemen or helicopters. However, most of the existing inspection robots are heavy, which make them slow and prone to external wind disturbance. This paper developed a lightweight dual-arm robot and investigates its robustness to wind disturbance on a lab-scale power line structure. The dynamic equations of the robot are derived using the Lagrangian equation for appropriate motor selection. Also, the components of the robot are designed to ensure low drag coefficient to wind flow, and the mechanism of the wind force on the robot-line coupled system is presented. To study the real-time impact of the wind, a wind speed of 4.5 m/s representing one of the windiest cities in China is considered as a case study. The experimental results for different wind directions, namely, 0°, 45°, and 90°, show that the maximum vibration is 8% higher than the normal vibration of the system in a controlled environment without wind. The results demonstrate that there is little influence of the wind on the system; hence, the robot has been successfully designed and can be applied for power line inspection.

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Full-Scale Tests and Numerical Simulations of Failure Mechanism of Power Transmission Towers

Cited by 36 publications

References 12 publications

Failure analysis of a transmission tower subjected to combined wind and rainfall excitations

Failure analysis of a transmission tower subjected to combined wind and rainfall excitations

Evaluation of Seismic Performance of Steel Lattice Transmission Towers

Investigation of Aerodynamic Stability of a Lightweight Dual‐Arm Power Transmission Line Inspection Robot under the Influence of Wind

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