The response of a guyed transmission line system to boundary layer wind

Hamada, Ahmed; King, Jenny; Damatty, Ashraf A. El; Bitsuamlak, Girma; Hamada, Mohamed M.

doi:10.1016/j.engstruct.2017.01.047

Cited by 22 publications

(7 citation statements)

References 14 publications

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“…This model was extended to be capable of performing both quasi-static and dynamic analyses for steel lattice transmission line structures under turbulent wind loading by Aboshosha et al (2016). This model was validated using the results of the multi-span guyed transmission line aero-elastic wind tunnel test conducted at the Boundary Layer Wind Tunnel Laboratory (BLWTL) at University of Western Ontario by Hamada et al (2017). A comparison between the numerical model and the test results showed a very good agreement as reported by Aboshosha et al (2016).…”

Section: Numerical Modelmentioning

confidence: 77%

Dynamic behaviour of pre-stressed concrete transmission poles under synoptic wind loading

Damatty

Aboshosha

2022

Advances in Structural Engineering

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A numerical model capable of predicting the dynamic response of pre-stressed concrete transmission poles under both the mean and fluctuating components of synoptic wind loads is developed in this study. A full non-linear dynamic analysis is conducted under a time history variation of wind velocity. The peak total responses, such as conductors’ reactions and poles’ base moments, are determined from this analysis. The same analysis is repeated in a quasi-static manner. Dynamic amplification factors (DAF), defined as the ratio between the maximum response based on a non-linear dynamic analysis and the corresponding value based on a quasi-static analysis, are calculated for the poles and the conductors to quantify the dynamic impact of synoptic wind loads. This factor is used to assess the importance of including the resonant component while estimating the response of the transmission poles. In addition, gust response factors (GRF) defined as the ratio between the peak and mean responses are evaluated and compared to GRF recommended by ASCE-74 (2010). A parametric study is conducted on three pre-stressed concrete transmission line systems. The mean value of the incoming wind speed is the main variable included in the parametric study. It is found that the resonant effect is dominant in the conductors at low wind speeds and the poles exhibit high dynamic response at higher wind speeds.

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Section: Numerical Modelmentioning

confidence: 77%

Dynamic behaviour of pre-stressed concrete transmission poles under synoptic wind loading

Damatty

Aboshosha

2022

Advances in Structural Engineering

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“…Furthermore, these researches help to solve problems of practical engineering interest, such as pollutant dispersion in complex terrain or urban areas, in which buildings produce different flow patterns (Baouabe et al, 2011). Moreover, several other applications can be potentially benefited by this kind of study, such as wind-farm energy production (Barriatto and Petry, 2018); development of infrastructure for overhead transmission lines in the electricity sector (Hamada et al, 2017); vibration assessment of structural cables (Jafari et al, 2020); assessment of the impact of atmospheric flow and stability on offshore oil platforms and large vessels (Liu et al, 2020); and external environments atmospheric flow evaluation of airborne disease dissemination, such as COVID-19 (Feng et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental evaluation of the thermally stratified atmospheric boundary layer in wind tunnels

2021

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The atmospheric boundary layer (ABL) flow occurs due to the interaction between the Earth's surface and atmosphere, and it usually happens under thermal stratification. Therefore, in order to emulate this phenomenon, atmospheric wind tunnels need appropriate devices, such as spires and cubical roughness elements, at the entrance of the wind tunnel to create atmospheric characteristics for the analysis. In the current study, numerical and experimental investigations of the thermally stratified boundary layer are performed. The experimental data are measured using Inmetro's atmospheric wind tunnel. Two different spires set configurations and inlet velocities are considered. Moreover, the compressible Navier-Stokes equations using the k-epsilon turbulence model are computed by OpenFOAM opensource software. The simulated results and measured data presented a good overall agreement and showed that the proposed configuration provides the desired thermal and dynamic boundary layer necessary for the study of ABL.

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“…Xie and Sun (2013) carried out a 1:2 large scale model test on the transmission tower to study the failure principle of the tower in a strong wind environment. Hamada et al (2017) studied the aeroelastic characteristics and structural responses of a lattice transmission system through simultaneous tests on lattice towers and conductors. Recently, Shu et al (2018) analyzed the influence of wind loads on the ultimate bearing capacity of the transmission tower based on the experimental tests and finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

Wind tunnel tests and dynamic analysis of wind-induced response of a transmission tower on a hill

Guo

Xiao

2021

Advances in Structural Engineering

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A hill with a lattice transmission tower presents complex wind field characteristics. The commonly used computational fluid dynamics (CFD) simulations are difficult to analyze the wind resistance and dynamic responses of the transmission tower due to structural complexity. In this study, wind tunnel tests and numerical simulations are conducted to analyze the wind field of the hill and the dynamic responses of the transmission tower built on it. The hill models with different slopes are investigated by wind tunnel tests to measure the wind field characteristics, such as mean speed and turbulence intensity. The study shows that the existence of a transmission tower reduces the wind speed on the leeward slope significantly but has little effect on the windward slope. To study the dynamic behavior of the transmission tower, a hybrid analysis procedure is used by introducing the measured experimental wind information to the finite element tower model established using ANSYS. The effects of hill slope on the maximum displacement response of the tower are studied. The results show that the maximum value of the response is the largest when the hill slope is 25° compared to those when hill slope is 15° and 35°. The results extend the knowledge concerning wind tunnel tests on hills of different terrain and provide a comprehensive understanding of the interactive effects between the hill and existing transmission tower regarding to the wind field characteristics and structural dynamic responses.

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The response of a guyed transmission line system to boundary layer wind

Cited by 22 publications

References 14 publications

Dynamic behaviour of pre-stressed concrete transmission poles under synoptic wind loading

Dynamic behaviour of pre-stressed concrete transmission poles under synoptic wind loading

Numerical and experimental evaluation of the thermally stratified atmospheric boundary layer in wind tunnels

Wind tunnel tests and dynamic analysis of wind-induced response of a transmission tower on a hill

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