Wind tunnel measurement of overall and sectional drag coefficients for a super high-rise steel tube transmission tower

Li, Yan; Li, Zhengliang; Savory, Eric; Zhong, Yongli; Yan, Zhitao

doi:10.1016/j.jweia.2020.104363

Cited by 21 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies have shown that the half-height of downbursts is usually about 400 m [13], and the height of most transmission towers is less than 100 m. Then, it can be concluded that the value of H/δ for most transmission towers is less than 0.25, and thus the influence of the half-height on the DAF for most transmission towers is very small. Some special super-high steel tube transmission towers with large values of H/δ, in which the steel tubes are filled with concrete [74,75], are not within the scope of the current study. To consider the influence of the dynamic response in the structural design with synoptic wind field, the gust load factor (GLF) is defined as the ratio of the peak displacement response and the mean displacement response of the structure in the National building In the present study, the GLF of the transmission tower is calculated by the frequency domain analysis and compared with the above DAFs.…”

Section: Dynamic Effectmentioning

confidence: 99%

Frequency Domain Analysis of Alongwind Response and Study of Wind Loads for Transmission Tower Subjected to Downbursts

Zhong

Jin

et al. 2022

Buildings

Self Cite

View full text Add to dashboard Cite

Downburst is one of the high-intensity winds that cause transmission tower failures. The regulations of transmission tower-line systems under downburst wind loads cannot meet the design requirements at present. In this paper, the calculation formulas of the background and resonant components of transmission tower under downburst wind loads are obtained, based on the modal analysis theory of non-stationary wind for the single-degree-of-freedom system in the frequency domain. The effects of structural dynamic characteristics, damping ratio, and mean wind speed vertical profile on dynamic effect on structural response are discussed. Then the equivalent static wind load (ESWL) is obtained according to the maximum response and compared with the finite element method (FEM) in the time domain. Applications of these formulas are addressed to the cases from the empirical model of Holmes and field record of a rear flank downdraft (RFD). The results show that the maximum responses obtained by the current formulas match well with those from the modal decomposition method and dynamic analysis with FEM. The internal forces of tower members calculated by ESWL based on maximum response are closer to the results from FEM than those calculated by downburst loads recommended in ASCE guidelines. The presented framework can be used to assist the wind-resistant design of transmission towers considering downburst wind load.

show abstract

Section: Dynamic Effectmentioning

confidence: 99%

Frequency Domain Analysis of Alongwind Response and Study of Wind Loads for Transmission Tower Subjected to Downbursts

Zhong

Jin

et al. 2022

Buildings

Self Cite

View full text Add to dashboard Cite

show abstract

“…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. In the segmental model experiment, the test is conducted by padding the test platform to exceed the thickness of the viscous layer and placing an end-plate to diminish the end effects (Li et al, 2018(Li et al, , 2020. Carril et al (2003) analyzed the effect of various wind angles, densities, shading effects, and turbulence on the drag 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

View full text Add to dashboard Cite

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.

show abstract

Investigation on Combined Wind Load Factors of Lattice Transmission Tower Body under the Action of Skewed Wind

2021

View full text Add to dashboard Cite

Wind tunnel measurement of overall and sectional drag coefficients for a super high-rise steel tube transmission tower

Cited by 21 publications

References 21 publications

Frequency Domain Analysis of Alongwind Response and Study of Wind Loads for Transmission Tower Subjected to Downbursts

Frequency Domain Analysis of Alongwind Response and Study of Wind Loads for Transmission Tower Subjected to Downbursts

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

Investigation on Combined Wind Load Factors of Lattice Transmission Tower Body under the Action of Skewed Wind

Contact Info

Product

Resources

About