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The effect of different tornado wind fields on the response of transmission line structures

  • Ezami, Nima (Department of Civil and Environmental Engineering, The University of Western Ontario) ;
  • El Damatty, Ashraf (Department of Civil and Environmental Engineering, The University of Western Ontario) ;
  • Hamada, Ahmed (Department of Civil and Environmental Engineering, The University of Western Ontario) ;
  • Hamada, Mohamed (Department of Civil and Environmental Engineering, The University of Western Ontario)
  • 투고 : 2021.08.05
  • 심사 : 2021.12.21
  • 발행 : 2022.02.25

초록

Majority of transmission line system failures at many locations worldwide have been caused by severe localized wind events in the form of tornadoes and downbursts. This study evaluates the structural response of two different transmission line systems under equivalent F2 tornadoes obtained from real incidents. Two multi-span self-supported transmission line systems are considered in the study. Nonlinear three-dimensional finite element models are developed for both systems. The finite element models simulate six spans and five towers. Computational Fluid Dynamics (CFD) simulations are used to develop the tornado wind fields. Using a proper scaling method for geometry and velocity, full-scale tornado flow fields for the Stockton, KS, 2005 and Goshen County WY, 2009 are developed and considered together with a previously developed tornado wind field. The tornado wind profiles are obtained in terms of tangential, radial, and axial velocities. The simulated tornadoes are then normalized to the maximum velocity value for F2 tornadoes in order to compare the effect of different tornadoes having an equal magnitude. The tornado wind fields are incorporated into a three-dimensional finite element model. By varying the location of the tornado relative to the transmission line systems, base shears of the tower of interest and peak internal forces in the tower members are evaluated. Sensitivity analysis is conducted to assess the variation of the structural behaviour of the studied transmission lines associated with the location of the tornado relative to the tower of interest. The tornado-induced forces in both lines due to the three different normalized tornadoes are compared with corresponding values evaluated using the simplified load case method recently incorporated in the ASCE-74 (2020) guidelines, which was previously developed based on the research conducted at Western University.

키워드

과제정보

The authors gratefully acknowledge Hydro One Network Inc., the Natural Sciences and Engineering Research Council of Canada (NSERC) for their collaboration and the financial support provided for this research.

참고문헌

  1. Altalmas, A., El Damatty, A.A. and Hamada, A. (2012), "Progressive failure of transmission towers under tornado loading", CSCE Annual Conference, Edmonton, June.
  2. American Society of Civil Engineers (ASCE) (2020), Guidelines for Electrical Transmission Line Structural Loading. ASCE Manuals and Reports on Engineering Practice, No. 74, New York, NY, U.SA.
  3. Baker, G.L. and Church, C.R. (1979), "Measurements of core radii and peak velocities in modeled atmospheric vortices", J. Atmos. Sci., 36(12), 2413-2424. https://doi.org/10.1175/1520-0469(1979)036%3C2413:MOCRAP%3E2.0.CO;2.
  4. Behncke, R.H. and White, H.B. (2006), "Applying gust loadings to your lines", Proceedings of the 9th International Conference on Overhead Lines, Fort Collins, ASCE, CO, U.S.A.
  5. Church, C.R., Snow, J.T. and Agee, E.M. (1977), "Tornado vortex simulation at Purdue University", Bull. Amer. Meteor. Soc. 58(9), 900-908. https://doi.org/10.1175/1520-0477(1977)058%3C0900:TVSAPU%3E2.0.CO;2.
  6. Church, C.R., Snow, J.T., Baker, G.L. and Agee, E.M. (1979), "Characteristics of tornado-like vortices as a function of swirl ratio: A laboratory investigation", J. Atmos. Sci. 36(9), 1755-1776. https://doi.org/10.1175/1520-0469(1979)036%3C1755:COTLVA%3E2.0.CO;2.
  7. Davies-Jones, RP. (1973), "The dependence of core radius on swirl ratio in a tornado simulator", J. Atmos. Sci. 30(7), 1427-1430. https://doi.org/10.1175/15200469(1973)030%3C1427:TDOCRO%3E2.0.CO;2.
  8. Dempsey, D. and White, H.B. (1996), "Winds wreak havoc on lines", Transm. Distrib. World, 48(6), 32-42.
  9. El Damatty, A.A. and Hamada, A. (2016), "F2 tornado velocity profiles critical for transmission line structures", Eng. Struct., 106(1), 436-449. https://doi.org/10.1016/j.engstruct.2015.10.020.
  10. El Damatty, A.A., Ezami, N. and Hamada, A. (2018), "Case study for behaviour of transmission line structures under full-scale flow field of stockton, Kansas, 2005 tornado, electrical transmission and substation structures", ASCE, November, 4-8, Atlanta, Georgia, U.S.A.
  11. El Damatty, A.A., Hamada, M. and Hamada, A. (2015), "Simplified F2 tornado load cases for transmission line structures", 14th Intranational Conference on Wind Engineering, ICWE14, Porto Alegre, Brazil.
  12. Fujita, T.T. (1981), "Tornadoes and downbursts in the context of generalized planetary scales", J. Atmos. Sci. 38(8), 1511-1534. https://doi.org/10.1175/15200469(1981)038%3C1511:TADITC%3E2.0.CO;2.
  13. Fujita, T.T. and Pearson, A.D. (1973), "Results of FPP classification of 1971 and 1972 tornadoes", 8th Conference on Severe Local Storms, U.S.A.
  14. Haan, F.L., Sarkar, P.P. and Gallus, W.A. (2008), "Design, construction and performance of a large tornado simulator for wind engineering applications", Eng. Struct., 30(4), 1146-1159. https://doi.org/10.1016/j.engstruct.2007.07.010.
  15. Hamada, A. and El Damatty, A.A. (2011), "Behaviour of guyed transmission line structures under tornado wind loading", Comput. Struct., 89(11-12), 986-1003. https://doi.org/10.1016/j.compstruc.2011.01.015.
  16. Hamada, A. and El Damatty, A.A. (2015), "Failure analysis of guyed transmission lines during f2 tornado event", Eng. Struct., 85(15), 11-25. https://doi.org/10.1016/j.engstruct.2014.11.045.
  17. Hamada, A. and El Damatty, A.A. (2014), "Nonlinear formulation of four-nodded cable element and application to transmission lines under tornadoes", International Conference on Advances in Wind and Structures - ACEM14, Busan.
  18. Hamada, A., El Damatty, A.A., Hangan, H. and Shehata, A.Y. (2010), "Finite element modelling of transmission line structures under tornado wind loading", Wind Struct., 13(5), 451-469. https://doi.org/10.12989/was.2010.13.5.451.
  19. Hamada, A., King, J.P.C., El Damatty, A.A., Bitsuamlak, G. and Hamada, M. (2017), "The response of a guyed transmission line system to boundary layer wind", Eng. Struct., 139, 135-152. https://doi.org/10.1016/j.engstruct.2017.01.047.
  20. Hangan H. and Kim, J. (2008), "Swirl ratio effects on tornado vortices in relation to the Fujita scale", Wind Struct., 11(4), 291-302. https://doi.org/10.12989/was.2008.11.4.291.
  21. Harlow, F.H. and Stein, L.R. (1974), "Structural analysis of tornado like vortices", J. Atmos. Sci., 31(8), 2081-2098. https://doi.org/10.1175/15200469(1974)031%3C2081:SAOTLV%3E2.0.CO;2.
  22. Ishac, M.F. and White, H.B. (1994), "Effect of tornado loads on transmission lines", Proceedings of the 1994 IEEE Power Engineering Society Transmission and Distribution Conference, Chicago, IL, U.S.A.
  23. Kosiba, K.A. and Wurman, J. (2013), "The three-dimensional structure and evolution of a tornado boundary layer", Weath. Forecast., 28(6), 1552-1561. https://doi.org/10.1175/WAF-D13-00070.1.
  24. Lee, W.C., Jou, B.J., Chang, P.L. and Deng, S.M. (1999), "Tropical cyclone kinematic structure retrieved from single-Doppler radar observations. Part I: Doppler velocity patterns and the GBVTD technique", Month. Weath. Rev., 127(10), 2419 - 2439. https://doi.org/10.1175/1520-0493(1999)127%3C2419:TCKSRF%3E2.0.CO;2.
  25. Liu, Z. and Ishihara, T. (2015), "Numerical study of turbulent flow fields and the similarity of tornado vortices using large-eddy simulations", J. Wind Eng. Ind. Aerod., 145, 42-60. https://doi.org/10.1016/j.jweia.2015.05.008.
  26. Liu, Z., Cao, Y., Wang, Y., Cao, J., Hua, X. and Cao, S. (2021), "Characteristics of compact debris induced by a tornado studied using largeeddy simulations", J. Wind Eng. Ind. Aerod., 208,104422. https://doi.org/10.1016/j.jweia.2020.104422.
  27. Lund, D.E. and Snow, J. (1993), "The tornado: its structure, dynamics, prediction, and hazards", Geophys. Monogr. Ser., 79, 297-306. https://ui.adsabs.harvard.edu/link_gateway/1993GMS....79.....C/doi:10.1029/GM079.
  28. McCarthy, P. and Melsness, M. (1996), "Severe weather elements associated with September 5, 1996 hydro tower failures near Grosse Isle, Manitoba", Manitoba Environmental Service Centre, Environment Canada.
  29. Mishra, A.R., James, D.L. and Letchford, C.W. (2008), "Physical simulation of a single-celled tornado-like vortex, Part A: Flow field characterization", J. Wind Eng. Ind. Aerod., 96(8-9), 1243-1257. https://doi.org/10.1016/j.jweia.2008.02.063.
  30. Natarajan, D. (2011), Numerical Simulation of Tornado-Like Vortices, Master Thesis, The University of Western Ontario.
  31. Refan, M. and Hangan, H. (2018), "Near surface experimental exploration of tornado vortices", J. Wind Eng. Ind. Aerod., 175, 120-135. https://doi.org/10.1016/j.jweia.2018.01.042.
  32. Refan, M., Hangan, H. and Wurman, J. (2014), "Reproducing tornadoes in laboratory using proper scaling", J. Wind Eng. Ind. Aerod., 135, 136-148. https://doi.org/10.1016/j.jweia.2014.10.008.
  33. Refan, M., Hangan, H., Wurman, J. and Kosiba, K. (2017), "Doppler radar-derived wind field of several tornadoes with application to engineering simulations", Eng. Struct., 148, 509-521. https://doi.org/10.1016/j.engstruct.2017.06.068.
  34. Rotunno, R. (1979), "A Study in tornado-like vortex dynamics", J. Atmos. Sci., 36(1), 140-155. https://doi.org/10.1175/1520-0469(1979)036%3C0140:ASITLV%3E2.0.CO;2.
  35. Sarkar, P., Haan, F., Gallus, W. Jr., Le, K. and Wurman, J. (2005), "Velocity measurements in a laboratory tornado simulator and their comparison with numerical and fullscale data", 37th Joint Meeting Panel on Wind and Seismic Effects, Tsukuba, Japan.
  36. Wakimoto, R.M., Atkins, N.T. and Wurman, J. (2011), "The LaGrange tornado during VORTEX2. Part I: photogrammetric analysis of the tornado combined with single-Doppler radar data", Month. Weath. Rev., 139(7), 2233-2258. https://doi.org/10.1175/2010MWR3568.1.
  37. Wang, H., James, D., Letchford, C.W., Peterson, R. and Snow, J. (2001), "Development of a prototype tornado simulator for the assessment of fluid-structure interaction", First American Conference on Wind Dngineering, Clemson, SC.
  38. Ward, N.B. (1972), "The exploration of certain features of tornado dynamics using a laboratory model", J. Atmos. Sci., 29(6), 1194-1204. https://doi.org/10.1175/1520-0469(1972)029%3C1194:TEOCFO%3E2.0.CO;2.
  39. Wurman, J. and Gill, S. (2000), "Finescale radar observations of the dimmitt, Texas (2 June 1995) tornado", Month. Weath. Rev., 128(7), 2135-2164. https://doi.org/10.1175/1520-0493(2000)128%3C2135:FROOTD%3E2.0.CO;2.