New Nonlinear Roof Sheathing Fastener Model for Use in Finite-Element Wind Load Applications
Publication: Journal of Structural Engineering
Volume 134, Issue 10
Abstract
Performance-based design is being developed and implemented in seismic and fire resistant design. The field of structural wind engineering has introduced several techniques that may eventually lead to performance-based wind engineering for buildings such as database assisted design. For wood-frame buildings, one deficiency is the lack of accurate load/response models with the ability to go beyond first failure leaving only force-based approaches which protect life safety but only infer certain levels of performance. This paper introduces a new nonlinear roof sheathing fastener model that is a function of not only the uplift pressure acting on the roof sheathing, but the effective moment arm (not just the moment) acting on the edge nails. A targeted set of experimental tests was conducted to determine the effect of the load eccentricity, a new stiffness matrix for a nail element formulated, and illustrative examples presented for a roof sheathing assembly analyzed using the finite element procedure. The model is shown to result in a significantly reduced capacity from current state-of-the-art finite element analyses which assume only nail withdrawal. It is anticipated that this more accurate nail model can aid in the development of performance-based wind engineering for wood-frame buildings.
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References
Ellingwood, B. E., et al. (2006). “Performance-based engineering for light-frame wood construction in the United States: Status and challenges.” 2006 World Conf. on Timber Engineering (CD-ROM).
Lee, H. K., and Rosowsky, D. V. (2005). “Fragility assessment for roof sheathing failure in high wind regions.” Eng. Struct., 27, 857–868.
Rosowsky, D. V., and Cheng, N. (1999a). “Reliability of light-frame roofs in high-wind regions. I: Wind loads.” J. Struct. Eng., 125(7), 725–733.
Rosowsky, D. V., and Cheng, N. (1999b). “Reliability of light-frame roofs in high-wind regions. II: Reliability analysis.” J. Struct. Eng., 125(7), 734–739.
Rosowsky, D. V., and Schiff, S. D. (1996). “Probabilistic modeling of roof sheathing uplift capacity.” Proc., Probabilistic Mechanics and Structural Specialty Conf., ASCE, Reston, Va., 334–337.
van de Lindt, J. W. (2005). The E-Proc. of the 1st Invitational Workshop on Performance-Based Design of Woodframe Structures, ⟨www.engr.colostate.edu/~jww⟩ (Aug. 2007).
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Copyright
© 2008 ASCE.
History
Received: Oct 8, 2007
Accepted: Jan 30, 2008
Published online: Oct 1, 2008
Published in print: Oct 2008
Notes
Note. Associate Editor: Rakesh Gupta
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