In Situ Nail Withdrawal Strengths in Wood Roof Structures
Publication: Journal of Structural Engineering
Volume 140, Issue 5
Abstract
Premature failure of wood roof sheathing under wind loading has primarily been blamed on poor nail installation resulting in reduced nail withdrawal strengths. However, this increased vulnerability could also result from environmental effects and aging of the materials, but little information exists on the in situ withdrawal strengths of nails in actual wood buildings. To address this knowledge gap, the authors evaluated the withdrawal strengths of nails from 17 existing Florida homes, and they observed relatively low in situ nail withdrawal capacities in the tests. Further, laboratory tests compared the withdrawal strengths of nails determined using an industry-standard test protocol against an in situ nail test procedure. The study documented the effects of (1) through-sheathing nail installation, (2) nail withdrawal rate, and (3) sheathing removal methods on nail withdrawal capacity. The in situ nail test procedure consistently produced lower nail withdrawal capacities than did the industry-standard test protocol. Nail withdrawal capacity is reduced by combination of local sheathing removal methods to access the nail head, and by driving nails through sheathing. The results suggest empirically determined nail withdrawal capacity for nails provide nonconservative results.
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Acknowledgments
This project was funded by the Florida Division of Emergency Management, Grant ID # 08RC-B5-13-00-05-162, awarded to the University of Florida. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Florida Division of Emergency Management. Several civil engineering students contributed to this study, and the authors would like to acknowledge the contributions of Carl Harrigan, Griffin Malatino, Kenneth M. Hill, David B. Roueche and Craig R. Dixon for their efforts and assistance in field and laboratory testing.
References
American Forest and Paper Association (AFPA). (2005a). National design specification for wood construction (NDS), Washington, DC.
American Forest and Paper Association (AFPA). (2005b). National design specification for wood construction, in dowel-type fasteners, Washington, DC.
ASTM. (2006a). “Test methods for mechanical fasteners in wood.” D1761-06, West Conshohocken, PA.
ASTM. (2006b). “Test methods for direct moisture content measurement of wood and wood-base materials.” D4442-07, West Conshohocken, PA.
ASTM. (2006c). “Test methods for specific gravity of wood and wood-based materials.” D 2395-02, West Conshohocken, PA.
Balderrama, J. A., et al. (2011). “The Florida coastal monitoring program (FCMP): A review.” J. Wind Eng. Ind. Aerod., 99(9), 979–995.
Baskaran, A., and Dutt, O. (1997). “Performance of roof fasteners under simulated loading conditions.” J. Wind Eng. Ind. Aerod., 72(1–3), 389–400.
Bohnhoff, D. R., Moody, R. C., Verrill, S. P., and Shirek, L. F. (1991). “Bending properties of reinforced and unreiforced spliced nail-laminated posts.” Research Paper, Forest Products Laboratory, U.S. Dept. of Agriculture Forest Service, Madison, WI.
Borkenhagen, E. H., and Heyer, O. C. (1950). “Resistance to direct withdrawal of various types of nails driven into green and dry wood and subjected to cycles of wetting and drying.” Unpublished Research Rep., Forest Products Laboratory, U.S. Department of Agriculture Forest Service, Madison, WI, 23.
Feldborg, T. (1989). “Timber joints in tension and nails in withdrawal under long-term loading and alternating humidity.” Forest Prod. J., 39(11–12), 8–12.
FEMA, F.T.R. (1992). Building performance: Hurricane Andrew in Florida- observations, recommendations, and technical guidance, Federal Emergency Management Agency, Federal Insurance Administration, Washington, DC.
Forest Products Laboratory. (1931). “Nail holding power of American woods.” Technical Note 236, U.S. Dept. of Agriculture, Forest Service, Washington, DC.
Graettinger, A. J., van de Lindt, J. W., Gupta, R., Pryor, S. E., Skaggs, T. D., and Fridley, K. J. (2006). “Overview of wind damage to woodframe structure caused by Hurricane Katrina.” Struct. Congr. 2006, Structural Engineering Institute (SEI) of ASCE, Reston, VA.
Gurley, K. R., and Masters, F. J. (2011). “Post-2004 Hurricane field survey of residential building performance.” Nat. Hazards Rev., 177–183.
Herzog, B., and Yeh, B. (2006). “Nail withdrawal and pull-through strength of structural-use panels.” Proc., 9th World Conf. on Timber Engineering, Oregon State Univ. Conference Services, Corvallis, OR.
Kallem, M. R. (1997). Roof sheathing attachment for high wind regions: Comparison of screws and nails, Clemson Univ., Clemson, SC.
Kurtenacker, R. S. (1965). “Performance of container fasteners subjected to static and dynamic withdrawal.”, Forest Products Laboratory, USDA Forest Service, Madison, WA, 20.
Liu, Z., Prevatt, D. O., Aponte-Bermudez, L. D., Gurley, K. R., Reinhold, T. A., and Akins, R. E. (2009). “Field measurement and wind tunnel simulation of hurricane wind loads on a single family dwelling.” Eng. Struct., 31(10), 2265–2274.
Parker, D., and Sherwin, J. (1998). “Comparative summer attic thermal performance of six roof constructions.” Proc., 1998 ASHRAE Annual Meeting, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, GA.
Prevatt, D. O. (2008). “Hurricane resistance of Florida residential construction: in-field evaluation of practicality, acceptability and effectiveness of hurricane retrofit mitigation methods.”, RCMP (Residential Construction Mitigation Program) Division of Emergency Management, Tallahassee, FL, 100.
Pye, S. J., Jr. (1995). “Effect of in-service conditions on the withdrawal capacity of roof sheathing fasteners.” M.S. thesis, Clemson Univ., Clemson, SC.
Rammer, D. R., and Zelinka, S. L. (2004). “Review of end grain nail withdrawal research.”, Forest Products Laboratory, USDA Forest Service, Madison, WI, 28.
Rosowsky, D. V., and Reinhold, T. A. (1999). “Rate-of-load and duration-of-load effects for wood fasteners.” J. Struct. Eng., 719–724.
Sherman, M. D. (2000). “Effect of loading rate on capacities of nailed connections and fasteners in wood.” M.Sc. thesis, Clemson Univ., Clemson, SC.
Sparks, P. R. (1991). “Damages and lessons learned from hurricane Hugo.” NIST Special Publication 820, Gaithersburg, MD, 435–450.
Sutt, E., Leichti, R. J., and Reinhold, T. (2008). “Design methodology for fastener schedules on sheathing panels subject to negative pressure.” Proc., 10th World Conf. on Timber Engineering, Engineered Wood Products Association (EWPA), Madison, WI.
Sutt, E., Reinhold, T., and Rosowsky, D. (2000). “The effect of in-situ conditions on nail withdrawal capacities.” Proc., World Conf. of Timber Engineering, Washington State Univ., Pullman, WA.
Swane, R. A., and Vagholkar, M. K. (1968). “Effect of heat on static withdrawal resistance of plain shank nails in some australian timbers.” Build. Sci., 3(1), 51–63.
U.S. Census Bureau. (2011). “American Housing Survey.” http://factfinder2.census.gov/faces/tableservices/jsf/pages/productview.xhtml?pid=AHS_2011_C01AH&prodType=table〉.
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© 2014 American Society of Civil Engineers.
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Received: Jul 7, 2012
Accepted: Oct 29, 2013
Published online: Feb 13, 2014
Published in print: May 1, 2014
Discussion open until: Jul 13, 2014
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