Wind and Structures

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Assessment of wind-induced fragility of transmission towers under quasi-static wind load

  • Wang, Dahai (Department of Building Engineering, Wuhan University of technology) ;
  • Li, Sen (Department of Building Engineering, Wuhan University of technology) ;
  • Sun, Chao (Department of Civil and Environmental Engineering, Louisiana State University) ;
  • Huang, Guoqing (School of Civil Engineering, Chongqing University) ;
  • Yang, Qingshan (School of Civil Engineering, Chongqing University)
  • Received : 2021.03.10
  • Accepted : 2021.10.15
  • Published : 2021.10.25
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Abstract

Overhead power transmission line systems consisting of long-span conductors and high-rise towers are wind-sensitive structures featured with significant structural nonlinearity and fragility under wind hazards. To assess wind-induced structural fragility of a transmission tower, a novel efficient quasi-static approach, which is based on the analytical probability distribution of extreme wind effect in frequency domain and the probabilistic wind-resistant capacity, is developed in the present study. The 90-degree wind direction (perpendicular to conductors), which is always the worst scenario, is considered in this paper. The structural nonlinearity and failure modes are captured using a nonlinear static push-over analysis method, which simulates the failure process of the tower structure with random initial geometric defects. Wind-resistance performance of the tower is quantified based on the principle of energy equivalence. Damage of the tower is classified into three levels including slight damage, severe damage, and collapse. The tower fragility curve, which predicts damage of the tower as a function of wind speed, is presented and discussed.

Keywords

Acknowledgement

The support from the National Natural Science Foundation of China (Grant No. 51878527; 51720105005; 51478373) is greatly appreciated.

References

  1. Aboshosha, H., Elawady, A., El Ansary, A. and El Damatty, A. (2016), "Review on dynamic and quasi-static buffeting response of transmission lines under synoptic and non-synoptic winds", Eng. Struct., 112(Apr.1), 23-46. https://doi.org/10.1016/j.engstruct.2016.01.003.
  2. American Society of Civil Engineers (ASCE) (2009), "Guidelines for electrical transmission line structural loading", ASCE Manuals Report. Eng. Practice, 74, 59-69. https://doi.org/10.1061/9780784410356.
  3. Banik, S.S., Hong, H.P. and Kopp, G.A. (2010), "Assessment of capacity curves fortransmission line towers under wind loading", Wind Struct., 13(1), 1-20. https://doi.org/10.12989/was.2010.13.1.001.
  4. Cai, Y., Xie, Q., Xue, S., Hu, L. and Kareem, A. (2019), "Fragility modelling framework for transmission line towers under winds", Eng. Struct., 191, 686-697. https://doi.org/10.1016/j.engstruct.2019.04.096.
  5. Davenport, G.A. (1964), "Note on the distribution of the largest value of a random function with applications to gust loading", Proceedings of the Institution of Cavil Engineers, 28(2),187-196. https://doi.org/10.1680/iicep.1964.10112.
  6. Fu, X., Li, H.N., Tian, L., Wang, J. and Cheng, H. (2019), "Fragility analysis of transmission line subjected to wind loading", J. Perform. Construct. Facilities, 33(4), 04019044. https://doi.org/10.1061/(ASCE)CF.1943-5509.0001311.
  7. GB50068-2001 (2001), Unified Standard for Reliability Design of Building Structures, China Architecture & Building Press, Beijing, China.
  8. Holmes, J.D. (2007), Wind Loading of Structures, London: Spon Press.
  9. Holmes, J.D. (2008), "Recent developments in the specification of wind transmission lines", Wind Eng. Int. J., 5(1), 8-18.
  10. Joint Committee on Structural Safety (2001), JCSS Probabilistic Model Dode: Part 3-Material Properties, Copenhagen, Denmark.
  11. Kafali, C. and Grigoriu, M. (2007), "Seismic fragility analysis: application to simple linear and nonlinear systems", Earthq. Eng. Struct. Dyn. 36(13), 1885-1900. https://doi.org/10.1002/eqe.726.
  12. Krawinkler, H. and Seneviratna P. (1998), "Pros and cons of a pushover analysis of seismic performance evaluation", Eng. Struct, 20(4-6), 452-464. https://doi.org/10.1016/S0141-0296(97)00092-8.
  13. Li, X., Zhang, W., Niu, H. and Wu, Z.Y. (2018), "Probabilistic capacity assessment of single circuit transmission tower-line system subjected to strong winds", Eng. Struct., 175,517-530. https://doi.org/10.1016/j.engstruct.2018.08.061.
  14. Loredo-Souza, A.M. and Davenport, A.G. (1998), "The effects of high winds on transmission lines", J. Wind Eng. Ind. Aerod., 74, 987-994. https://doi.org/10.1016/S0167-6105(98)00090-7
  15. Ma, T.Q. and Sun, C. (2021), "Large eddy simulation of hurricane boundary layer turbulence and its application for power transmission system", J. Wind Eng. Ind. Aerod., 210,104520. https://doi.org/10.31224/osf.io/z674t.
  16. Mara, T.G. and Hong, H.P. (2013), "Effect of wind direction on the response and capacity surface of a transmission tower", Eng. Struct., 57(DEC.), 493-501. https://doi.org/10.1016/j.engstruct.2013.10.004.
  17. Simiu, E. and Scanlan, R.H. (1996), "Wind effects on structures: fundamental and application to design", J. New Jersey: John Wiley & Sons, Inc.
  18. Yang, S.C. and Hong, H.P., (2016), "Nonlinear inelastic responses of transmission tower-line system under downburst wind", Eng. Struct., 123(seq.15), 490-500. https://doi.org/10.1016/j.engstruct.2016.05.047.
  19. Yang, S.C., Liu, T.J. and Hong, H.P. (2017), "Reliability of tower and tower-line systems under spatiotemporally varying wind or earthquake loads", J. Struct. Eng., 143(10), 04017137.1-04017137.13. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001835.