Wind and Structures

Techno-Press (테크노프레스)
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Modeling wind load paths and sharing in a wood-frame building

  • He, Jing (Department of Civil and Environmental Engineering, Louisianan State University) ;
  • Pan, Fang (Southwest Research Institute) ;
  • Cai, C.S. (Department of Civil and Environmental Engineering, Louisianan State University)
  • Received : 2018.03.31
  • Accepted : 2018.09.11
  • Published : 2019.09.25
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Abstract

While establishing adequate load paths in the light-frame wood structures is critical to maintain the overall structural integrity and avoid significant damage under extreme wind events, the understanding of the load paths is limited by the high redundant nature of this building type. The objective of the current study is to evaluate the system effects and investigate the load paths in the wood structures especially the older buildings for a better performance assessment of the existing building stock under high winds, which will provide guidance for building constructions in the future. This is done by developing building models with configurations that are suspicious to induce failure per post damage reconnaissance. The effect of each configuration to the structural integrity is evaluated by the first failure wind speed, amajor indicator beyond the linear to the nonlinear range. A 3D finite-element (FE) building model is adopted as a control case that is modeled using a validated methodology in a highly-detailed fashion where the nonlinearity of connections is explicitly simulated. This model is then altered systematically to analyze the effects of configuration variations in the model such as the gable end sheathing continuity and the gable end truss stiffness, etc. The resolution of the wind loads from scaled wind tunnel tests is also discussed by comparing the effects to wind loads derived from large-scale wind tests.

Keywords

Acknowledgement

Supported by : NSF

References

  1. Ahmad, S. and Kumar, K. (2002), "Effect of geometry on wind pressures on low-rise hip roof buildings", J. Wind Eng. Ind. Aerod., 90(7), 755-779. https://doi.org/10.1016/S0167-6105(02)00152-6.
  2. ASCE 7-10. (2010), "Minimum design loads for buildings and other structures", Reston (Virginia): American Society of Civil Engineers.
  3. Asiz, A., Chui, Y.H., Zhou, L. and Smith, I. (2009), "Development of advanced system design procedure in Canadian Wood Design Standard. Final Report", Natural Resources Canada, Ottawa.
  4. Cope A. (2004), "Predicting the vulnerability of typical residential buildings to hurricane damage", Ph.D. Dissertation, University of Florida, Gainesville, FL.
  5. Cramer, S.M. and Wolfe, R.W. (1989), "Load-distribution model for light frame wood roof assemblies", J. Struct. Eng., 115(10), 2603-2616. https://doi.org/10.1061/(ASCE)0733-9445(1989)115:10(2603)
  6. Dade County. (1988), "South Florida Building Code", Dade County Board of County Commissioners, Miami, Dade County, FL.
  7. Datin, P.L. (2010), "Structural load paths in low-rise, wood-framed structures", Ph.D. Thesis. Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL.
  8. Dao, T. and van de Lindt, J. (2008), "New nonlinear roof sheathing fastener model for use in finite-element wind load applications", J. Struct. Eng., 134 (10), 1668-1674. https://doi.org/10.1061/(ASCE)0733-9445(2008)134:10(1668).
  9. Dikkers, R.D., Marshall, R.D. and Thom, H.C.S. (1970), "Hurricane Camille-August 1969: A survey of structural damage along the Mississippi Gulf Coast", National Bureau of Standards, Washington, DC.
  10. Pan, F., Cai, C.S., Zhang, W. and Kong, B. (2014), "Refined damage prediction of low-rise building envelope under high wind load", Wind Struct., 18(6), 669-691. https://doi.org/10.12989/was.2014.18.6.669.
  11. FEMA. (2005), "Hurricane Charley in Florida, Report #488", Washington, DC: Federal Emergency Management Agency.
  12. FEMA. (2006), "Summary report on building performance, Report #548", Washington, DC: Federal Emergency Management Agency.
  13. Fischer, C. and Kasal, B. (2009), "Analysis of light-frame, lowrise buildings under simulated lateral wind loads", Wind and Structures, 10.12989/was.2009.12.2.089, 89-101. Online publication date: 25-Mar-2009.
  14. Fritz, W. P., Bienkiewicz, B., Cui, B. and Flamand, O. (2008), "International comparison of wind tunnel estimates of wind effects on low-rise buildings: Test-related uncertainties", J. Struct. Eng., 134(12), 1887-1890. https://doi.org/10.1061/(ASCE)0733-9445(2008)134:12(1887).
  15. Gjinolli, G. and Vogt, J. (2007), Wood Truss Gable End Frames, Structure magazine, Aug.
  16. He, J., Pan, F. and Cai, C.S. (2017), "A review of wood-frame low-rise building performance study under hurricane winds", Eng. Struct., 141, 512-529. https://doi.org/10.1016/j.engstruct.2017.03.036.
  17. He, J., Pan, F. and Cai, C.S. (2018a), "Assessment of ASCE 7-10 for wind effects on low-rise wood frame buildings with database-assisted design methodology", Wind Struct., 27(3), 163-173. https://doi.org/10.12989/was.2018.27.3.163
  18. He, J., Pan, F., and Cai, C.S., Habte, F. and Chowdhury, A. (2018b), "Finite-element modeling framework for predicting realistic responses of light-frame low-rise buildings under wind loads", Eng. Struct., 164(1), 53-69. https://doi.org/10.1016/j.engstruct.2018.01.034.
  19. He, J., Pan, F., Cai, C.S., Habte, F. and Chowdhury, A. (2018c), "New DAD application: progressive failure of low-rise timber buildings under extreme wind events", J. Wind Eng. Ind. Aerod., under second review.
  20. Ho, T.C.E., Surry, D., Morrish, D. and Kopp, G.A. (2005), "The UWO contribution to the NIST aerodynamic database for wind loads on low buildings: Part1. Archiving format and basic aerodynamic data", J. Wind Eng. Ind. Aerod., 93(1), 1-30. https://doi.org/10.1016/j.jweia.2004.07.006.
  21. Holmes, J.D. (1979), "Mean and fluctuating internal pressure induced by wind", Proceedings of the 5th Int. Conf. on Wind Engineering, Fort Collins, Colo. 435-450.
  22. Hoxey, R.P., Robertson, A. and Short, L. (1998), "The role of corner vortices in the design of structures", Struct. Eng. Int., 1(98), 50-55.
  23. ICC. (2007), "Florida Building Code", Building, International Code Council, Inc., Falls Church, VA.
  24. Jacklin, R.B., El Damatty, A.A. and Dessouki, A.A. (2014), "Finite-element modeling of a light-framed wood roof structure", Wind Struct., 19(6), 602-621. https://doi.org/10.12989/was.2014.19.6.603.
  25. Karava, P. and Stathopoulos, T. (2012), "Wind-induced internal pressures in buildings with large facade openings", J. Eng. Mech., 138(4), 358-370. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000296.
  26. Malone, B., Miller, T. and Gupta, R. (2013), "Gravity and wind load path analysis of a light-frame and a traditional timber frame building", J. Archit. Eng., https://doi.org/10.1061/(ASCE)AE.1943-5568.0000136
  27. Martin, K.G., Gupta, R., Prevatt, D.O., Datin, P.L. and van de Lindt, J.W. (2011), "Modeling system effects and structural load paths in a wood-framed structure", J. Archit. Eng., 17(4), 134-143.1 https://doi.org/10.1061/(ASCE)AE.1943-5568.0000045.
  28. Meecham, D., Surry, D. and Davenport, A.G. (1991), "The magnitude and distribution of wind-induced pressures on hip and gable roofs", J. Wind Eng. Ind. Aerod., 38(2-3), 257-272. https://doi.org/10.1016/0167-6105(91)90046-Y.
  29. Mensah, A.F., Datin, P.L., Prevatt, D.O., Gupta, R. and van de Lindt, J.W. (2011), "Database-assisted design methodology to predict wind-induced structural behavior of a light-framed wood building", Eng. Struct., 33(2), 674-684. https://doi.org/10.1016/j.engstruct.2010.11.028.
  30. Pan, F., Cai, C. and Zhang, W. (2013), "Wind-induced internal pressures of buildings with multiple openings", J. Eng. Mech., 10, 376-385. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000464.
  31. Pfretzschner, K., Gupta, R. and Miller, T. (2014), "Practical modeling for wind load paths in a realistic light-frame wood house", J. Perform. Constr. Fac., 28(3), https://doi.org/10.1061/(ASCE)CF.1943-5509.0000448.
  32. Prevatt, D.O. and Datin, P.L. (2007), "Wind uplift reactions at roof-to-wall connections of wood-framed gable roof assembly", SC Sea Grant Project Number: R191.
  33. Roueche, D.B., Prevatt, D.O., Haan, F.L. and Datin, P.L. (2015), "An estimate of tornado loads on a wood-frame building using database-assisted design methodology", J. Wind Eng. Ind. Aerod., 138, 27-35. https://doi.org/10.1016/j.jweia.2014.11.011.
  34. Satheeskumar, N., Henderson, D., Ginger, J. and Wang, C. (2016), "Wind uplift strength capacity variation in roof-to-wall connections of timber-framed houses", J. Archit. Eng., 22(2), https://doi.org/10.1061/(ASCE)AE.1943-5568.0000204.
  35. Shivarudrappa, R. and Nielson, B. (2013), "Sensitivity of load distribution in light-framed wood roof systems due to typical modeling parameters", J. Perform. Constr. Fac., 27(3), https://doi.org/10.1061/(ASCE)CF.1943-5509.0000323.
  36. Sparks, P.R. (1991), "Hurricane Hugo in perspective", NIST Special Publication 820, National Institute of Standards & Technology, 29-37.
  37. Tieleman, H.W. (1996), "Model/full scale comparison of pressures on the roof of the TTU experimental building", J. Wind Eng. Ind. Aerod., 65(1-3), 133-142. https://doi.org/10.1016/S0167-6105(97)00030-5.
  38. Tieleman, H.W. (2003), "Wind tunnel simulation of wind loading on low rise structures: A review", J. Wind Eng. Ind. Aerod., 91(12-15), 1627-1649. https://doi.org/10.1016/j.jweia.2003.09.021.
  39. US Census Bureau. (2003), "Census of population and housing (2000)", U.S. Dept. of Commerce, Economics and Statistics Administration, Washington, D.C.
  40. US Census Bureau. (2007), "2007 Population Estimates", US Dept. of Commerce, Economics and Statistics Administration, Washington, D.C., Accessed 9/16/2009 from factfinder.census.gov.
  41. van de Lindt, J.W., Graettinger, A., Gupta, R., Skaggs, T., Pryor, S., and Fridley, K.J. (2007), "Performance of wood-frame structures during Hurricane Katrina", J. Perform. Constr. Fac., 21(2), 108-116. https://doi.org/10.1061/(ASCE)0887-3828(2007)21:2(108).
  42. Wilson, S. and Rischetti, T. (2010), "Coastline population trends in the United States: 1960 to 2008", U.S. Census Bureau.
  43. Wolfe, R.W. and McCarthy, M. (1989), "Structural performance of light-frame roof assemblies: I. Truss assemblies with high truss stiffness variability", FPL-RP-492, Forest Products Laboratory, Madison, WI. 1989.
  44. Wolfe, R.W. and LaBissoniere, T. (1991), "Structural Performance of Light-Frame Roof Assemblies II. Conventional Truss Assemblies", Forrest Products Laboratory, Research Paper: FPL-RP-499