Calculation methods of torsion response and torsion equivalent static wind loading of transmission tower

doi:10.3785/j.issn.1008-973X.2022.03.017

Journal of ZheJiang University (Engineering Science)

2022, Vol. 56

Issue (3): 579-589 DOI: 10.3785/j.issn.1008-973X.2022.03.017

Calculation methods of torsion response and torsion equivalent static wind loading of transmission tower

Guo-hui SHEN1(

),Bao-heng LI1,Yong GUO2,Zheng ZHAO3,Feng PAN2

1. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China
2. China Energy Engineering Group Zhejiang Electric Power Design Institute Limited Company, Hangzhou 310012, China
3. China Power Engineering Consulting Group East China Electric Power Design Institute Limited Company, Shanghai 200063, China

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Abstract

A theoretical calculating method to deal with the along-line torsion response and torsion equivalent static wind load was proposed aiming to the torsion effect of transmission tower. The influence of different torsion modes and coherence functions on the torsion response was analyzed. Aeroelastic model wind tunnel tests were carried out to justify the theoretical results. The calculating methods of gust loading factors considering both the torsion and translational effects were developed. Results show that calculating results of the along-line torsion responses are coincided well with those of the aeroelastic model tests, indicating the rationality of the proposed methods. The horizontal and vertical coherence functions should both be adopted to obtain the torsion response. When wind blows from the along cross arm direction, the theoretical torsion responses are less than those of the aeroelastic model tests, which is due to the signature turbulence induced by the shielding effect of tower members. The torsion magnified factor (TMF) of tower body is small, whereas the TMF of the cross-arm cannot be ignored in which a factor up to 1.1 can be found.

Key words： transmission tower torsion effect equivalent static wind load aeroelastic model long cross arm

Received: 29 March 2021 Published: 29 March 2022

CLC:

TU 312.1

Fund: 国家自然科学基金资助项目（51838012, 52178511）

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Cite this article:

Guo-hui SHEN,Bao-heng LI,Yong GUO,Zheng ZHAO,Feng PAN. Calculation methods of torsion response and torsion equivalent static wind loading of transmission tower. Journal of ZheJiang University (Engineering Science), 2022, 56(3): 579-589.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.03.017 OR https://www.zjujournals.com/eng/Y2022/V56/I3/579

输电塔扭转响应和扭转等效风荷载的计算方法

针对输电塔的扭转效应，提出顺线路方向扭转响应和扭转等效风荷载的理论计算方法，分析扭转模态和相干函数对扭转响应的影响，进行气弹模型风洞试验以验证计算结果的准确性，给出同时考虑扭转与平动的风振系数计算公式. 结果表明：所提出顺线路方向扭转响应计算方法与风洞试验结果非常接近，计算方法的准确性得以验证；扭转响应计算中应同时考虑水平向与竖直向的相干函数；顺横担方向来流时的扭转响应理论计算结果小于风洞试验值，原因是此时杆件间的遮挡效应产生特征湍流；塔身的扭转放大系数可忽略，横担的扭转放大系数不可忽略，最大值为1.1.

关键词： 输电塔, 扭转效应, 等效风荷载, 气弹模型, 长横担

Fig.1 Dimensional layout of T-shaped transmission tower

Tab.1 Section of angle steel member of T-type transmission tower

Fig.2 First three-order torsion mode of T-shaped transmission tower

Fig.3 First three-order torsion mode of T-shaped transmission tower cross arm and tower body

Fig.4 Standard deviation of torsion angle of different modes

Fig.5 Standard deviation of torsion angle of different coherence functions

Fig.6 Standard deviation of torsion angle at end of downward cross arm at 0°

Fig.7 Equivalent torsion of T-shaped transmission tower

Tab.2 Similarity coefficient of aeroelastic model

Fig.8 Aerodynamic model of transmission tower

Fig.9 Schematic diagram of wind direction angle and force coordinate system

Fig.10 B-typed terrain category simulated in wind tunnel

Fig.11 Measure point arrangement for displacement response

Tab.3 Modal parameter identification results

Fig.12 Displacement time history of measuring points

Fig.13 Time history of torsion angle of cross arm

Fig.14 Standard deviation of torsion angle at end of downward cross arm at 0°

Tab.4 Skewed wind loading distribution factor

Fig.15 Standard deviation of torsion angle of inclined wind downward cross arm end point

Fig.16 Wind vibration coefficient of T-shaped transmission tower

Fig.17 T-shaped transmission tower torsion amplification factor

Fig.18 Wind vibration coefficient of T-shaped transmission tower under 0°wind


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