The Performance of Composite Wood/Particleboard Beams Under Two-Point Loading

Authors

  • Jay A. Johnson
  • Geza Ifju
  • Harry W. Rogers

Keywords:

<i>Pinus sp.</i> (southern pine), <i>Quercus sp.</i>, <i>Nyssa sp.</i>, <i>Liriodendron tulipifera</i>, flexural rigidity, elastic properties, composite beam formulas, failure surfaces, stress concentrations, nails, modulus of elasticity, stress analysis

Abstract

Twelve composite wood/particleboard box and I beams were tested under two-point loading. The observed flexural rigidity, EI, was found to be less than the calculated values based on properties of the individual elements. Load bearing capacity was predicted on the basis of the weakest component, which in this study appeared to be the tensile strength of the particleboard. Measured maximum loads were greater than predicted loads. The load-deflection curves were linear to failure, exhibiting virtually no warning signals prior to failure. Failure in many instances was associated with nails used to fabricate the beams. Performance of the beams was estimated to be the equivalent of an intermediate grade 2 X 10 with a 50% strength reduction.

References

Goodman, J. R. 1969. Layered wood systems with interlayer slip. Wood Sci.1 (3):148-158.nHoyle, Jr., R. J. 1973. Behavior of wood I beams bonded with elastomeric adhesives. Washington State University, Engineering Research Bulletin No. 328. Pullman, Washington.nHunt, M. O. 1975. Structural particleboard for webs of composite beams? For. Prod. J.25 (2):55-57.nJohnson, J. A., G. Ifju, and H. W. Rogers. 1975. The performance of composite wood/particleboard beams under two-point loading. Virginia Polytechnic Institute and State University Wood Science and Technology Report No. VPI-WST 75-1, pp. 17.nMcNatt, J. D. 1973. Basic engineering properties of particleboard. USDA For. Ser. Res. Paper FPL 206. 14 pp. Madison, WI.nRamaker, T. J. and M. D. Davister. 1972. Predicting performance of hardboard in I beams. USDA For. Ser. Res. Paper FPL 185. 13 pp. Madison, WI.nU.S. Forest Products Laboratory. 1974. Wood handbook: Wood as an engineering material. USDA Agr. Handbook No. 72, rev. U.S. For. Prod. Lab., Madison, WI.n

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Published

2007-06-05

Issue

Number 2 / Summer 1976

Section

Research Contributions

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