Metal-plate Connected Tension Joints Under Different Loading Conditions
Keywords:Metal-plate, joints, wood truss, combined loading
AbstractMetal-plate connected tension-splice wood truss joints were tested under six different loading conditions: pure axial tension, pure bending, and four different levels of combined (axial tension/bending) loading. All joints were fabricated from 2- by 4-in. nominal No. 2 southern yellow pine lumber and 20-gage metal truss plates. Joints were tested to failure on a newly developed testing apparatus. Combined loading tests showed that the axial load capacity of joints decreased with an increase in applied bending moment. The most common mode of failure was tooth withdrawal, which indicates that tooth-holding capacity governs the strength of the joint.
American Society for Testing and Materials. 1990a. Standard test methods for moisture content of wood. D2016-74. Annual book of ASTM standards, vol. 04.09. Philadelphia, PA.nAmerican Society for Testing and Materials. 1990b. Standard test methods for specific gravity of wood and wood-based materials. D2395-83. Annual book of ASTM standards, Vol. 04.09. Philadelphia, PA.nAmerican Society for Testing and Materials. 1991. Standards methods of testing mechanical fasteners in wood. D1761-77. Annual book of ASTM standards, Vol 04.09. Philadelphia, PA.nCanadian Standards Association. 1980. Methods of test for evaluation of truss plate used in lumber joints. CSA Standard S347-M1980. Ottawa, Ontario.nEuropean Union of Agrement (UEATc). 1990. Rule for the assessment of punched metal plate timber fasteners. MOAT 16. 4 Avenue du Recteur-Poincare, 75782 Paris Cedex 16.nFelton, K. E., and H. D. Bartlett. 1964. Punched-metal truss plates used in timber joints. Trans. ASAE 7(2): 159-163.nGupta, R. 1990. Reliability analysis of metal plate connected residential wood trusses. Ph.D. thesis, Cornell University, Ithaca, NY.nGupta, R., and K. G. Gebremedhin. 1990. Destructive testing of metal-plate-connected wood truss joints. ASCE J. Struct. Eng. 116(7):1971-1982.nHayashi, T., and H. Sasaki. 1982. Static tensile strength of wood but joints with metal plate connectors. Pages 22-36 in Wood research no. 68, Bulletin of the Wood Research Institute. Kyoto University, Uji, Kyoto, Japan.nInternational Organization for Standardization. 1990. Timber structures—Testing of unilateral punched metal plate fasteners and joints. ISO 8969:1990(E). Case Postales 56, CH-1211 Geneva 20, Switzerland.nKirk, L. S., T. E. McLain, and F. E. Woeste. 1989. Effect of gap size on performance of metal-plated joints in compression. Wood Fiber Sci. 21(3):274-288.nMcAlister, R. H. 1989. Interaction between truss plate design and type of truss framing. Forest Prod. J. 39(7/8):17-24.nQuaile, A. T., and F. J. Keenan. 1979. Truss plate testing in Canada: Test procedure and factors affecting strength properties. Pages 105-112 in Proceedings, Metal Plate Wood Truss Conference. Forest Products Research Society, Madison, WI.nSnedecor, G. W., and W. G. Cochran. 1980. Pages 279-280, 489 in Statistical methods, 7th ed. The Iowa State University Press, Ames, IA.nSuddarth, S. K., D. H. Percival, and Q. B. Comus. 1979. Variability in tension performance of metal plate connections. Pages 98-104 in Proceedings, Metal Plate Truss Wood Conference. Forest Products Research Society, Madison, WI.nTruss Plate Institute. 1985. Design specification for metal plate connected wood trusses: TPI-85. Madison, WI.nWolfe, R. W. 1990. Metal-plate connections loaded in combined bending and tension. Forest Prod. J. 40(9):17-23.nWolfe, R. W., M. Hall, and D. Lyles. 1991. Test apparatus for simulating interactive loads on metal plate wood connections. J. Testing Eval. 19(6):421-428.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.