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Capacity of a transmission tower under downburst wind loading
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  • Journal title : Wind and Structures
  • Volume 22, Issue 1,  2016, pp.65-87
  • Publisher : Techno-Press
  • DOI : 10.12989/was.2016.22.1.065
 Title & Authors
Capacity of a transmission tower under downburst wind loading
Mara, T.G.; Hong, H.P.; Lee, C.S.; Ho, T.C.E.;
 Abstract
The wind velocity profile over the height of a structure in high intensity wind (HIW) events, such as downbursts, differs from that associated with atmospheric boundary layer (ABL) winds. Current design codes for lattice transmission structures contain only limited advice on the treatment of HIW effects, and structural design is carried out using wind load profiles and response factors derived for ABL winds. The present study assesses the load-deformation curve (capacity curve) of a transmission tower under modeled downburst wind loading, and compares it with that obtained for an ABL wind loading profile. The analysis considers nonlinear inelastic response under simulated downburst wind fields. The capacity curve is represented using the relationship between the base shear and the maximum tip displacement. The results indicate that the capacity curve remains relatively consistent between different downburst scenarios and an ABL loading profile. The use of the capacity curve avoids the difficulty associated with defining a reference wind speed and corresponding wind profile that are adequate and applicable for downburst and ABL winds, thereby allowing a direct comparison of response under synoptic and downburst events. Uncertainty propagation analysis is carried out to evaluate the tower capacity by considering the uncertainty in material properties and geometric variables. The results indicated the coefficient of variation of the tower capacity is small compared to those associated with extreme wind speeds.
 Keywords
transmission towers;downbursts;extreme winds;nonlinear analysis;Monte Carlo technique;
 Language
English
 Cited by
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Nonlinear inelastic responses of transmission tower-line system under downburst wind, Engineering Structures, 2016, 123, 490  crossref(new windwow)
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 References
1.
American Society of Civil Engineers (ASCE) (2010), Guidelines for Electrical Transmission Line Structural Loading (3rd edition), ASCE Manuals and Reports on Engineering Practice No. 74, Reston, VA, USA.

2.
ANSYS(R) (2007), ANSYS Multiphysics, Release 9.0. ANSYS Inc., Canonsburg, PA.

3.
Banik, S.S., Hong, H.P. and Kopp, G.A. (2008), "Assessment of tornado hazard for spatially distributed systems in southern Ontario", J. Wind Eng. Ind. Aerod., 96(8-9), 1376-1389. crossref(new window)

4.
Banik, S.S., Hong, H.P. and Kopp, G.A. (2010), "Assessment of capacity curves for transmission line towers under wind loading", Wind Struct., 13(1), 1-20. crossref(new window)

5.
Bartlett, F.M., Hong, H.P. and Zhou, W. (2003), "Load factor calibration for the proposed 2005 edition of the National Building Code of Canada: Statistics of loads and effects", Can. J. Civ. Eng., 30(2), 429-439. crossref(new window)

6.
Canadian Standards Association (CSA) (2010), Design criteria of overhead transmission lines, CAN/CSA-C22.3 No. 60826-10, CSA, Toronto, Canada.

7.
Darwish, M.M. and El Damatty, A.A. (2011), "Behaviour of self supported transmission line towers under stationary downburst loading", Wind Struct., 14(5), 481-498. crossref(new window)

8.
Davenport, A.G. (1979). "Gust response factors for transmission lines", Proceedings of the 5th International Conference on Wind Engineering, Fort Collins, CO, USA.

9.
Durst, C.S. (1960), "Wind speeds over short periods of time", Met. Mag. 89, 181-186.

10.
Ellingwood, B.R., Galambos, T.V., MacGregor, J.G. and Cornell, C.A. (1980). Development of a probability based load criterion for American National Standard A58, National Bureau of Standards, Washington D.C., USA.

11.
Fujita, T.T. (1976), Spearhead Echo and Downburst near the Approach end of a John F. Kennedy Airport Runway, New York City, SMRP Research Paper No. 137, University of Chicago.

12.
Fujita, T.T. (1985), The Downburst: Microburst and Macroburst, SMRP Research Paper No. 210, University of Chicago.

13.
Hangan, H., Roberts, D., Xu, Z. and Kim, J.D. (2003), "Downburst simulations. Experimental and numerical challenges", Proceedings of the 11th International Conference on Wind Engineering, Lubbock, TX, USA.

14.
Hangan, H., Savory, E., El Damatty, A., Galsworthy, J. and Miller, C. (2008), "Modeling and prediction of failure of transmission lines due to high intensity winds", Proceedings of the 2008 Structures Congress (ASCE), Vancouver, BC, Canada.

15.
Haukaas, T. and Der Kiureghian, A. (2006), "Strategies for finding the design point in non-linear finite element reliability analysis", Probabilist. Eng. Mech., 21(2), 133-147. crossref(new window)

16.
He, W.X. and Hong, H.P. (2012), "Probabilistic characterization of roof panel uplift capacity under wind loading", Can. J. Civ. Eng., 39(12), 1285-1296. crossref(new window)

17.
Holmes, J.D. and Oliver, S.E. (2000), "An empirical model of a downburst", Eng. Struct., 22(9), 1167-1172. crossref(new window)

18.
Holmes, J.D., Hangan, H.M., Schroeder, J.L., Letchford, C.W. and Orwig, K.D. (2008), "A forensic study of the Lubbock-Reese downdraft of 2002", Wind Struct., 11(1), 137-152. crossref(new window)

19.
Hong, H.P., Mara, T.G., Morris, R., Li, S.H. and Ye, W. (2014). "Basis for recommending an update of wind velocity pressures in Canadian design codes." Can. J. Civ. Eng., 41(3), 206-221. crossref(new window)

20.
Kim. J. and Hangan, H. (2007), "Numerical simulation of impinging jets with application to downbursts", J. Wind Eng. Ind. Aerod., 95(4), 279-298. crossref(new window)

21.
Krawinkler, H. and Seneviratna, G.D.P.K. (1998), "Pros and cons of a pushover analysis of seismic performance evaluation", Eng. Struct., 20(4-6), 452-464. crossref(new window)

22.
Lee, P.S. and McClure, G. (2007), "Elastoplastic large deformation analysis of a lattice steel tower structure and comparison with full-scale tests", J. Constr. Steel Res., 63(5), 709-717. crossref(new window)

23.
Lee, K.H. and Rosowsky, D.V. (2006), "Fragility curves for woodframe structures subjected to lateral wind load", Wind. Struct., 9(3), 217-230. crossref(new window)

24.
Lin, W.E., Savory, E., McIntyre, R.P., Vandelaar, C.S. and King, J.P.C. (2012), "The response of an overhead electrical power transmission line to two types of wind forcing", J. Wind Eng. Ind. Aerod., 100(1), 58-69. crossref(new window)

25.
Lombardo, F.T. (2009), Analysis and interpretation of thunderstorm wind flow and its effect on a bluff body. Ph.D. Dissertation, Texas Tech University.

26.
Lombardo, F.T., Smith, D.A., Schroeder, J.L. and Mehta, K.C. (2014), "Thunderstorm characteristics of importance to wind engineering", J. Wind Eng. Ind. Aerod., 125, 121-132. crossref(new window)

27.
Mara, T.G., Galsworthy, J.K. and Savory, E. (2010), "Assessment of vertical wind loads on lattice framework with application to thunderstorm winds", Wind Struct., 13(4), 413-431. crossref(new window)

28.
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, 493-501. crossref(new window)

29.
McCarthy, P. and Melsness, M. (1996), Severe Weather Elements Associated with September 5, 1996 Hydro Tower Failures Near Grosse Isle, Manitoba, Canada, Environment Canada, Winnipeg, Canada.

30.
Orwig, K.D. and Schroeder, J.L. (2007), "Near-surface wind characteristics of extreme thunderstorm outflows", J. Wind Eng. Ind. Aerod., 95(7), 565-584. crossref(new window)

31.
Savory, E., Parke, G.A.R., Zeinoddini, M., Toy, N. and Disney, P. (2001), "Modelling of tornado and microburst-induced wind loading and failure of a lattice transmission tower", Eng. Struct., 23(4), 365-375. crossref(new window)

32.
Shehata, A.Y., El Damatty, A.A. and Savory, E. (2005), "Finite element modeling of transmission line under downburst wind loading", Finit. Elem. Anal. Des., 42(1), 71-89. crossref(new window)

33.
Shehata, A.Y. and El Damatty, A.A. (2008), "Failure analysis of a transmission tower during a microburst", Wind Struct., 11(3), 193-208. crossref(new window)

34.
Wood, G.S., Kwok, K.C.S., Motteram, N.A. and Fletcher, D.F. (2001), "Physical and numerical modelling of thunderstorm downbursts", J. Wind Eng. Ind. Aerod., 89(6), 535-552. crossref(new window)