Impact of Out-of-Plane Stiffness of the Diaphragm on Deflection of Wood Light-Frame Shear Walls
The in-plane rigidity of light frame diaphragms has been investigated by researchers due to the importance of this subsystem regarding lateral force distribution between the lateral force resisting system (LFRS). Where research has lacked is in evaluating the impact of out-of-plane raigidity of the diaphragm on the deflection of shear walls. This study aims at investigating the effect of the diaphragm on the behavior of wood light-frame shear walls, in particular its out-of-plane rigidity was simulated by modeling the floors as beam. The out of plane stiffness of the diaphragm was investigated for idealized (infinitely stiff or flexible) as well as “realistic”. The results showed reductions in the shear wall deflection in the magnitude of approximately 80% considering the out of plane rigidity of the diaphragm. It was also concluded that considering conservative estimates of out-of-plane stiffness might lead to a very significant reduction in deflection and that assuming the floor diaphragm to be infinitely rigid out of plan seems to be reasonable. For diaphragms supported on multiple panels, further reduction in the deflection was observed. More work, particularly at the experimental level, is needed to verify the finding obtained in the numerical investigation related to the effect of out of plane diaphragm stiffness.
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 APA – The Engineered Wood Association. Report 106. Tacoma, Wash., US, 1966.
 Burgess, H. J., “Derivation of the Wall Racking Formula,” TRADA’s Design Guide for Timber Frame Housing. Research Report E/RR/36. Timber Research and Development Association, Hughenden Valley, Buckinghamshire, England, 1976.
 McCutcheon, B.,.“Racking Deformations in Wood Shear Walls,” Journal of Structural Engineering, vol.111, no. 2, pp. 257-269, 1985.
 CSA. Engineering Design in Wood. CSA O86-2014, Canadian Standards Association., Toronto, ON, 2014.
 Pei, S., and Van de Lindt, W.,“Coupled Shear-Bending Formulation for Seismic Analysis of Stacked, 2009.
 ASTM. Standard Test Methods of Static Tests of Lumber in Structural Sizes. ASTM D198-15, American Society for Testing and Materials. West Conshohocken, PA, US, 2015
 Falk, R. H. and ltani. R. Y. Finite Element Modeling of Wood Diaphragms. Journal of Structural Engineering, AS CE, 115(3): 543-559, 1989.
 Dolan, J. D. The Dynamic Response of Timber Shear Walls. Ph.D. thesis, University of British Columbia, Vancouver, Canada, 1989.
 van de Lindt, J. W. “Evolution of wood shear wall testing, modeling, and reliability analysis: Bibliography.” Pract. Period. Struct. Des. Constr., 91, 44–53, 2004.
 Kasal, B., Collins, M.S., Paevere, P., Design Models of Light Frame Wood Buildings under Lateral Load, Journal of Structural Engineering, 130(8), 1263- 1271, 2004.
 Doudak, G. and Smith, I.,”Capacities of OSB-Sheathed Light-Frame Shear-Wall Panels with or without Perforations.”, ASCE Journal of Structural Engineering, 135(3), 326–329,2009.
 Asiz, A., Chui, C. Y., Zhou, L., and Smith, I. (2010b). “Three-dimensional numerical model of progressive failure in wood light-frame buildings.” World Conf. on Timber Engineering (CD-ROM), Riva del Garda, Italy, 2010.
 S. Rossi, D. Casagrande, R. Tomasi, and M. Piazza, “Seismic elastic analysis of light timber-frame multistorey buildings: Proposal of an iterative approach,” Constr. Build. Mater., vol. 102, pp. 1154–1167, 2016.
 Computers and Structures, Inc. CSI Analysis Reference Manual: SAP2000, ETABS and SAFE, Berkeley, CA, 2017.
 Forest Products Laboratory, Wood handbook, ” wood as an engineering material,” General technical, report FPL ; GTR-113. Madison, WI : U.S. Department of Agriculture, Forest Service, Forest Products Laboratory: xi, (463) pages : ill. ; 28 cm, 1999.
 Bagheri, M.M. Study of Deflection of Single and Multi-Storey Wood Light-Frame Shear Walls. Ph.D. thesis, University of Ottwa, Ottawa, Canada, 2018.
 American Forest & Paper Association, Inc.,“National Design Specifications (NDS) for Wood Construction with Commentary and Supplement: Design Values for Wood Construction 2005 Edition.