Evaluation of wind loads on square transmission towers with angle members under skewed winds

Tang, Ya'nan; Duan, Zhongdong; Xu, Feng; Yan, Guirong Grace; Nie, Ming; Luo, Xiaoyu; Liu, Xiaolu

doi:10.1016/j.jweia.2022.105134

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…This element serves as the main catalyst for structural oscillations. In Chinese load regulations and wind engineering practices, the Davenport spectrum is frequently employed [19]. It postulates that the fluctuating wind velocity spectrum represents the mean measurements obtained at different elevations above the surface.…”

Section: Wind Load Simulationmentioning

confidence: 99%

A Monitoring Method for Transmission Tower Foots Displacement Based on Wind-Induced Vibration Response

Liu,

Zhao,

Wen

et al. 2023

SDHM

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The displacement of transmission tower feet can seriously affect the safe operation of the tower, and the accuracy of structural health monitoring methods is limited at the present stage. The application of deep learning method provides new ideas for structural health monitoring of towers, but the current amount of tower vibration fault data is restricted to provide adequate training data for Deep Learning (DL). In this paper, we propose a DT-DL based tower foot displacement monitoring method, which firstly simulates the wind-induced vibration response data of the tower under each fault condition by finite element method. Then the vibration signal visualization and Data Transfer (DT) are used to add tower fault data samples to solve the problem of insufficient actual data quantity. Subsequently, the dynamic response test is carried out under different tower fault states, and the tower fault monitoring is carried out by the DL method. Finally, the proposed method is compared with the traditional online monitoring method, and it is found that this method can significantly improve the rate of convergence and recognition accuracy in the recognition process. The results show that the method can effectively identify the tower foot displacement state, which can greatly reduce the accidents that occurred due to the tower foot displacement.

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Section: Wind Load Simulationmentioning

confidence: 99%

A Monitoring Method for Transmission Tower Foots Displacement Based on Wind-Induced Vibration Response

Liu,

Zhao,

Wen

et al. 2023

SDHM

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“…Simiu and Scanlan (1996) investigated several influence factors (e.g., the change of wind angle, the solidity ratio of the structure, and the shading effect) related to the wind loads of transmission towers. Aerodynamic characteristics coefficients (e.g., drag coefficients and wind load-distribution factors) can be used to determine the wind loads of transmission towers (Tang et al, 2022). Typically, the aerodynamic coefficients of towers are evaluated using the wind tunnel test, and the wind tunnel test of the rigid sectional model is an ideal and trustworthy approach for obtaining the aerodynamic coefficients.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the aerodynamic characteristics of combined angle transmission tower subject to skew wind

Shen,

Que,

Wan

2024

Advances in Structural Engineering

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The transmission towers served as crucial carriers in the process of power transmission. The combined angle transmission tower of dual-angle steel with cruciform section are relatively a novel type of angle tower, which is being more widely used in transmission lines. The studies on aerodynamic characteristics of combined angle tower in skewed wind are limited. In this paper, the wind tunnel tests are conducted to investigate the aerodynamic characteristics of the combined angle tower, and the high frequency force balance (HFFB) test is introduced to obtain the transverse and longitudinal forces on the tower using the direct force measurement (DFM) method. The drag coefficients and wind load-distribution factors of the combined angle tower are obtained from the wind tunnel tests, and the effects of interference and tower leg spacing on the wind loads of the tower legs are fully explored. It can be found that the aerodynamic coefficients and drag coefficients of the combined angle steel tower leg tend to decrease with the increase of interference members and it also decreases with the decrease of the tower leg spacing. The test wind load-distribution factors of the isolated leg are generally larger than those defined by seven typical codes (e.g., US, EU, Japanese, and Chinese codes) and significantly exceed the code-specified values under partial wind angles. The observations obtained from this study may provide helpful guidance on the wind-resistant design of this relatively novel type of combined angle tower.

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“…Several international investigations have been made to evaluate wind-induced forces for lattice towers or electric transmission towers by computational fluid dynamics [5][6][7][8],the values obtained with computational fluid dynamics (CFD) are reasonably compared with regulations in different countries, it is concluded that CFD analysis is a theoretical and practical modeling tool for the optimization of structures subjected to wind flow.…”

Section: Introductionmentioning

confidence: 99%

Analysis of an Electrical Transmission Tower by CFD: A Comparison to the Mexico Standards

Valdez

Rangel

Hernández

et al. 2023

CJAST

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Place and duration of Study: Faculty of Engineering, Autonomous University of Queretaro, January 2022 to May 2023. This study analyzed wind pressures in two ways: first, according to current Mexican standards, and second, by performing a dynamic wind analysis using Computational Fluid Dynamics (CFD). The present study focused on analyzing the transmission tower E71W21, which is commonly used as a suspension tower in Mexico. This tower has a height of 46.9 m and a base of 12 m, and is similar to the type of towers that collapsed in the city of Los Cabos, Mexico, by the passage of Hurricane Odile in 2014. Current regulations establish that transmission line towers may be out of scope and must be designed with particular specifications for each case, by numerical models and experimental studies in the wind tunnel. Two models were made, the first model which consisted of dividing the tower into 5 parts, in order to reduce the computational cost. The model was detailed by modeling the bars with their corresponding section and simplified to the most predominant thickness of the section. The second model is the complete tower as a rigid solid without distinction between the elements. The wind pressure values obtained using the current standards in Mexico and according to specification J100-50 were found to be 15-20% lower than the values obtained from the CFD simulation results. The difference can be presented by the mesh quality, turbulence model used, or simplifications by the need to reduce the computational cost. The analysis results are presented graphically as pressure and velocity contours, as well as streamlines. Computational fluid dynamics is a very useful tool for simulating physical experiments such as in a wind tunnel, although it cannot replace the need for physical experimentation. With the help of high-performance computers, Computational fluid dynamics models offer a detailed exploration of physical phenomena.

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Evaluation of wind loads on square transmission towers with angle members under skewed winds

Cited by 6 publications

References 19 publications

A Monitoring Method for Transmission Tower Foots Displacement Based on Wind-Induced Vibration Response

A Monitoring Method for Transmission Tower Foots Displacement Based on Wind-Induced Vibration Response

Experimental study on the aerodynamic characteristics of combined angle transmission tower subject to skew wind

Analysis of an Electrical Transmission Tower by CFD: A Comparison to the Mexico Standards

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