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Analysis of hurricane directionality effects using event-based simulation

  • Huang, Zhigang (Applied Research Associates) ;
  • Rosowsky, David V. (Forest Products and Civil Engineering, Oregon State University)
  • Published : 2000.09.25
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Abstract

This paper presents an approach for evaluating directionality effects for both wind speeds and wind loads in hurricane-prone regions. The focus of this study is on directional wind loads on low-rise structures. Using event-based simulation, hurricane directionality effects are determined for an open-terrain condition at various locations in the southeastern United States. The wind speed (or wind load) directionality factor, defined as the ratio of the N-year mean recurrence interval (MRI) wind speed (or wind load) in each direction to the non-directional N-year MRI wind speed (or wind load), is less than one but increases toward unity with increasing MRI. Thus, the degree of conservatism that results from neglecting directionality effects decreases with increasing MRI. It may be desirable to account for local exposure effects (siting effects such as shielding, orientation, etc.) in design. To account for these effects in a directionality adjustment, the factor described above for open terrain would need to be transformed to other terrains/exposures. A "local" directionality factor, therefore, must effectively combine these two adjustments (event directionality and siting or local exposure directionality). By also considering the direction-specific aerodynamic coefficient, a direction-dependent wind load can be evaluated. While the data necessary to make predictions of directional wind loads may not routinely be available in the case of low-rise structures, the concept is discussed and illustrated in this paper.

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References

  1. ASCE (1995), Minimum Design Loads for Buildings and Other Structures, ASCE 7-95, American Society of Civil Engineers, New York, NY.
  2. Batts, M.E., Cordes, M.R., Russell, L.R., Shaver, J.R. and Simiu, E. (1980), Hurricane Wind Speeds in the United States, NBS Building Science Series 124, U.S. Department of Commerce, National Bureau of Standards, Washington, DC.
  3. Davenport, A.G. (1977), "Prediction of risk under wind loading", Proceedings of 2nd International Conference on Structural Safety and Reliability (ICOSSAR), Munich, Germany, 511-538.
  4. Georgiou, P.N. (1985), Design Wind Speeds in Tropical Cyclone-Prone Regions, Ph.D. Dissertation, Department of Civil Engineering, University of Western Ontario, Canada.
  5. Huang, Z. (1999), Stochastic Models for Hurricane Hazard Analysis, Ph.D. Dissertation, Department of Civil Engineering, Clemson University, Clemson, SC.
  6. Huang, Z., Rosowsky, D.V. and Sparks, P.R. (1998), "Probability-based wind field modeling in GIS", Proceedings of International Conference on GIS Applications in Environmental Modeling, Hong Kong, June 1998.
  7. Huang, Z., Rosowsky, D.V. and Sparks, P.R. (1999), "Event-based hurricane simulation for the evaluation of wind speeds and expected insurance losses", Proceedings of 10th International Conference on Wind Engineering, Copenhagen, Denmark, 1417-1424.
  8. Neuman, C.J., Jarvinen, B.R., McAdie, C.J. and Elms, J.D. (1997), Tropical Cyclones of the North Atlantic Ocean, 1871-1992, U.S. Department of Commerce NOAA.
  9. Peterka, J.A. and Cermak, J.E. (1978), Wind-Tunnel Study of Atlanta Office Building, Department of Civil Engineering, Colorado State University, Fort Collins, CO.
  10. Rosowsky, D.V., Huang, Z. and Sparks, P.R. (2000), "Long-term risk assessment and expected damage to residential structures", Reliability Engineering & System Safety (special issue on risk assessment of engineering facilities), to appear.
  11. Russell, L.R. (1968), Probability Distributions for Texas Gulf Coast Hurricane Effects of Engineering Interest, Ph.D. Dissertation, Stanford University, Stanford, CA.
  12. Russell, L.R. (1971), Probability distributions for hurricane effects", ASCE Journal of Waterways, Harbors, and Coastal Engineering, 97(1), 139-154.
  13. Simiu, E. and Filliben, J.J. (1981), "Wind direction effects on cladding and structural loads", Engineering Structures, 3, 181-186 https://doi.org/10.1016/0141-0296(81)90027-4
  14. Simiu, E. and Heckert, N.A. (1998), "Ultimate wind loads and direction effects in non-hurricane and hurricaneprone regions", Environmetrics, 9, 433-444. https://doi.org/10.1002/(SICI)1099-095X(199807/08)9:4<433::AID-ENV313>3.0.CO;2-Q
  15. Simiu, E. and Scanlan R.H. (1996), Wind Effects on Structures, John Wiley & Sons, New York.
  16. Sparks, P.R. and Huang, Z. (1999), "Wind speed characteristics in tropical cyclones", Proceedings of 10th International Conference on Wind Engineering, Copenhagen, Denmark.
  17. Tryggvason, B.V., Surry, D. and Davenport, A.G. (1976), "Predicting wind-induced response in hurricane zones", ASCE Journal of Structural Division, 102(12), 2333-2350.
  18. Tuleya, R.E., Bender, M.A. and Kurihara, Y. (1984), "A simulation study of the landfall of tropical cyclones using a movable nested-mesh model", Monthly Weather Review, 112(1), 124-136. https://doi.org/10.1175/1520-0493(1984)112<0124:ASSOTL>2.0.CO;2
  19. Vickery, P.J. and Twisdale, L.A. (1995), "Prediction of hurricane wind speeds in the united states", ASCE Journal of Structural Engineering, 121(11), 1691-1699. https://doi.org/10.1061/(ASCE)0733-9445(1995)121:11(1691)
  20. Wen, Y.K. (1983), "Wind direction and structural reliability", ASCE Journal of Structural Engineering, 109(4), 1028-1041. https://doi.org/10.1061/(ASCE)0733-9445(1983)109:4(1028)
  21. Wen, Y.K. (1984), "Wind direction and structural reliability: II", ASCE Journal of Structural Engineering, 110(6), 1253-1264. https://doi.org/10.1061/(ASCE)0733-9445(1984)110:6(1253)

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