Predicting Performance Of Oriented Strandboard Under Concentrated Static Loading Conditions Using Finite Element Modeling
Keywords:Finite element model, oriented strandboard, concentrated static load, shear stress, bending stress
AbstractOriented strandboard (OSB) panels were tested under a concentrated static load (CSL). A finite element (FE) model with variation of stresses and strains in the thickness direction was established to simulate the deflection of OSB under 890-N CSL. The CSL ultimate load of each OSB panel was simulated by increasing the load in the FE model until the calculated stress met the corresponding measured strength. Comparison of the calculated and the experimental data showed that the initial failure had two modes: failure initiated by interlaminar shear stress in the major direction near the central layers and edge of the panel when modulus of rupture (MOR) to interlaminar shear strength ratio in the major direction was greater than 18.8, and failure initiated by bending stress in the major direction near the bottom layers and the loading spot when MOR to interlaminar shear strength ratio in the major direction was less than 17.4. Panel thickness determined the initial failure mode when the ratio of MOR to interlaminar shear strength in the major direction was between 17.4 and 18.8. The vertical density profile affected the distribution of bending stresses and MOR in the profile of panels and influenced the accuracy of the prediction of the FE model.
ANSYS INC (2006) ANSYS, Version 10.0. Canonsburg, PA.nAshton JE, Whitney JM (1970) Theory of laminated plates. TECHNOMIC Publishing Co Inc, Westport, CT.nASTM (1997) Standard test method for performance of wood and wood-based floor and roof sheathing under concentrated static and impact loads. E661-88. American Society for Testing and Materials, West Conshohocken, PA.nASTM (1999) Standard test methods for evaluating properties of wood-base fiber and particle panel materials. D1037-99. American Society for Testing and Materials, West Conshohocken, PA.nASTM (2000) Standard test methods for structural panels in planar shear (rolling shear). D2718-00el. American Society for Testing and Materials, West Conshohocken, PA.nBodig J, Jayne BA (1982) Mechanics of wood and wood composites. Van Nostrand Reinhold Company Inc., New York, NY.nBozo AM (2002) Spatial variation of wood composite. PhD Thesis. Washington State University, Pullman, WA.nChen Z, Yan N, Cooper P (2008) Effect of panel properties on the concentrated static load (CSL) performance of oriented strand board (OSB). Holz Roh Werkst 66(3): 207-212.nHoyle RJ, Tichy RJ, Itani RY (1982) Composite wood panel deflection under concentrated load. Wood Sci 15(2):65-77.nMoarcas O, Nicholls T (2002) Concentrated loads on floor deckings. Part 2: Design recommendations. J Inst Wood Sci 16(2):93-103.nShresha D (1999) Shear properties tests of oriented strandboard panels. Forest Prod J 49(10):41-46.nSoothill C (1984) Concentrated load capacity (punching shear strength) of wood chipboard. Part 2: Assessment of the influence of bending on the resistance of flooring chipboard to gradually applied concentrated loads. Research Report 2/84. Timber Research & Development Association (TRADA), Hughenden Valley, UK.nThomas WH (1996) Bending behavior of OSB decking under concentrated load. PhD Thesis. Department of Civil Engineering, University of Surrey, Guildford, Surrey, UK.nThomas WH (2002) Shear & flexual deflection equations for OSB floor decking with point load. Holz Roh Werkst 60:175-180.nTimoshenko S, Woinowsky-Kriegers S (1959) Theory of plate and shells. 2nd ed. McGraw-Hill, New York, NY.nXu D, Laufenberg TL (1988) Orthotropic plate deflection under concentrated load. Research Paper FPL-RP. USDA Forest Service, Forest Products Laboratory, Madison, WI.nYoungquist JA (1999) Wood-based composites and panel products. Wood handbook—Wood as an engineering material. USDA Forest Service, Forest Products Laboratory, Madison, WI.nZhang Y, Yan N, Cooper PA (2005) The relationship between concentrated static load performance and other physical and mechanical properties of OSB panels. Forest Prod J 55(12):148-152.nZienkiewicz OC, Taylor RL (2000) Finite element method. 5th ed. Vol. 1. The basis. Butterworth-Heinemann, Oxford, UK.n
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.