DOI QR코드

DOI QR Code

Finite element modelling of transmission line structures under tornado wind loading

  • Hamada, A. (Department of Civil and Environmental Engineering, Faculty of Engineering, The University of Western Ontario) ;
  • El Damatty, A.A. (Department of Civil and Environmental Engineering, Faculty of Engineering, The University of Western Ontario) ;
  • Hangan, H. (Alan G. Davenport Wind Engineering Group, The Boundary Layer Wind Tunnel Laboratory, Faculty of Engineering, The University of Western Ontario) ;
  • Shehata, A.Y. (Atomic Energy of Canada Limited)
  • Received : 2009.11.10
  • Accepted : 2010.03.09
  • Published : 2010.09.25

Abstract

The majority of weather-related failures of transmission line structures that have occurred in the past have been attributed to high intensity localized wind events, in the form of tornadoes and downbursts. A numerical scheme is developed in the current study to assess the performance of transmission lines under tornado wind load events. The tornado wind field is based on a model scale Computational Fluid Dynamic (CFD) analysis that was conducted and validated in a previous study. Using field measurements and code specifications, the CFD model data is used to estimate the wind fields for F4 and F2 full scale tornadoes. The wind forces associated with these tornado fields are evaluated and later incorporated into a nonlinear finite element three-dimensional model for the transmission line system, which includes a simulation for the towers and the conductors. A comparison is carried between the forces in the members resulting from the tornadoes, and those obtained using the conventional design wind loads. The study reveals the importance of considering tornadoes when designing transmission line structures.

References

  1. American National Standards Institute (ANSI) (1993), National Electrical Safety Code (NESC), Accredited Standards Committee C2, USA.
  2. American Society of Civil Engineers (ASCE) (1991), Guidelines for electrical transmission line structural loading (ASCE Manuals and Reports on Engineering Practice), No. 74, NY.
  3. Baker, D.E. (1981), Boundary layers in laminar vortex flows, Ph.D. thesis, Purdue University.
  4. Chay, M.T., Albermani, F. and Wilson, R.J. (2007), "Response of a guyed transmission line tower in simulated downburst winds", Proceedings of the 12th International Conference on Wind Engineering (ICWE12), Cairns, Australia, July.
  5. Computer and Structures, Inc. (2008), SAP2000 V.12, CSI Analysis Reference Manual, Berkeley, California, USA.
  6. Fluent Inc. (2005), Fluent 6.2 User's Guide, Lebanon.
  7. Hangan, H. and Kim, J.D. (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
  8. Lee, W.C. and Wurman, J. (2005), "Diagnosed three-dimensional axisymmetric structure of the Mulhall tornado on 3 May 1999", J.Atmos.Sci., 62(7), 2373-2393. https://doi.org/10.1175/JAS3489.1
  9. National Research Council Canada (2005), National Building Code of Canada 2005, Associate Committee on the National Building Code, Canada.
  10. Sarkar, P., Haan, F., Gallus, Jr., W., Le, K. and Wurman, J. (2005), "Velocity measurements in a laboratory tornado simulator and their comparison with numerical and full-scale data" Proceedings of the 37th Joint Meeting Panel on Wind and Seismic Effects, Tsukuba, Japan, May.
  11. Savory, E., Parke, G.A.R., Zeinoddini, M., Toy, N. and Disney, P. (2001), "Modelling of tornado and microburstinduced wind loading and failure of a lattice transmission tower" Eng. Struct., 23(4), 365-375. https://doi.org/10.1016/S0141-0296(00)00045-6
  12. Shehata, A.Y., and El Damatty, A.A. (2008), "Failure analysis of a transmission tower during a microburst" Wind Struct., 11(3), 193-208. https://doi.org/10.12989/was.2008.11.3.193
  13. Shehata, A.Y. and El Damatty, A.A. (2007), "Behaviour of guyed transmission line structures under downburst wind loading", Wind Struct., 10(3), 249-268. https://doi.org/10.12989/was.2007.10.3.249
  14. Shehata, A.Y., El Damatty, A.A. and Savory, E. (2005), "Finite element modelling of transmission line under downburst wind loading" Finite Elem. Anal. Des., 42(1), 71-89. https://doi.org/10.1016/j.finel.2005.05.005
  15. Wurman, J. (1998), "Preliminary results from the ROTATE-98 tornado study", Proceedings of the 19th Conference on Severe Local Storms, Minneapolis, MN, USA, September.

Cited by

  1. F2 tornado velocity profiles critical for transmission line structures vol.106, 2016, https://doi.org/10.1016/j.engstruct.2015.10.020
  2. Tornado hazard for structural engineering 2016, https://doi.org/10.1007/s11069-016-2392-z
  3. Finite element modelling of pre-stressed concrete poles under downbursts and tornadoes vol.153, 2017, https://doi.org/10.1016/j.engstruct.2017.10.047
  4. Dynamic Responses and Vibration Control of the Transmission Tower-Line System: A State-of-the-Art Review vol.2014, 2014, https://doi.org/10.1155/2014/538457
  5. Behaviour of guyed transmission line structures under tornado wind loading vol.89, pp.11-12, 2011, https://doi.org/10.1016/j.compstruc.2011.01.015
  6. Finite element modelling of self-supported transmission lines under tornado loading vol.18, pp.5, 2014, https://doi.org/10.12989/was.2014.18.5.473
  7. Behaviour of transmission line conductors under tornado wind vol.22, pp.3, 2016, https://doi.org/10.12989/was.2016.22.3.369
  8. The response of a guyed transmission line system to boundary layer wind vol.139, 2017, https://doi.org/10.1016/j.engstruct.2017.01.047
  9. Effect of net structures on wall-free non-stationary air heat vortices vol.64, 2013, https://doi.org/10.1016/j.ijheatmasstransfer.2013.05.008
  10. Failure analysis of guyed transmission lines during F2 tornado event vol.85, 2015, https://doi.org/10.1016/j.engstruct.2014.11.045