Load-Slip Characteristics of Metal Plate Connected Wood Joints Tested in Tension and Shear
Keywords:
Load-slip, metal plate, wood joint, stiffness, strength, modelingAbstract
Thirty-six metal plate connected wood joints were tested in tension and shear to failure to determine their strength and stiffness characteristics and failure modes. Twenty-one of the joints were tested in tension, and the rest were tested in shear. Test specimens included the four Canadian standard orientations and intermediate orientations of 30, 45, and 60°. For the joints tested in tension, failure was by plate shear for the 0°, by tooth withdrawal for the 30 and 45°, and by wood failure for the 60 and 90° orientations. For the joints tested in shear, failure was consistently by tooth withdrawal for the 0, 30, and 45°, and by plate shear for the 60 and 90° orientations.
A 2-parameter nonlinear model characterized the P-Δ curve quite well. When characterizing the P-Δ curve, the entire curve extending from zero to the ultimate load was used. The stiffness values for the intermediate angles were calculated from the stiffness values of the standard orientations using a Hankinson-type formula.
References
American Society for Testing and Materials. 1974. Standard test methods for moisture content of wood. ASTM D 2016-74. Annu. Book of Standards, Vol. 4.09, pp. 433-434.nAmerican Society for Testing and Materials. 1985. Standard methods of testing mechanical fasteners in wood. ASTM D 1761. Philadelphia, PA.nAmerican Society for Testing and Materials. 1988. Standard methods for testing mechanical fasteners in wood. ASTM D 1761-88. Annu. Book of Standards, Part 22, Philadelphia, PA.nCanadian Standards Association. 1980. Methods of test for evaluation of truss plates used in lumber joints. CSA Standard S347-M1980.nFoschi, R. O. 1977. Analysis of wood diaphragms and trusses. Part II: Truss-plate connections. Canadian J. Civil Eng. 4(3):353-362.nGebremedhin, K. G. 1986. SOLVER—An interactive structures analyzer for microcomputers. J. Appl. Eng. Agric. 2(1):10-13.nGupta, R., and K. G. Gebremedhin. 1990. Destructive testing of metal plate connected wood truss joints. J. Structures Div., ASCE 116(7):1971-1982.nHankinson, R. L. 1921. Investigation of crushing strength of spruce at varying angles of grain. U.S. Air Service Information Circular No. 259.nLau, Peter W. C. 1987. Factors affecting the behavior and modelling of toothed metal-plate joints. Canadian J. Civil Eng. 14(2):183-195.nMcCarthy, M., and J. Little. 1988. Sensitivity of truss plate model parameters to parameter determination methods. Forest Prod. J. 38(5):63-67.nMcCarthy, M., and R. W. Wolfe. 1987. Assessment of truss plate performance model applied to Southern Pine truss joints. Res. Pap. FPL-RP-483. Madison, WI: USDA, Forest Products Laboratory. 13 pp.nMaragechi, K., and R. Y. Itani. 1984. Influence of truss plate connectors on the analysis of light frame structure. Wood Fiber Sci. 16(3):306-322.nMassé, D. I., and J. J. Salinas. 1988. Analysis of timber trusses using semi-rigid joints. Can. Agr. Eng. 30(1):111-124.nMcMartin, K. C., A. T. Quaile, and F. J. Keenan. 1984. Strength and structural safety of long-span light wood roof trusses. Can. J. Civil Eng. 11:978-1007.nNational Forest Products Association. 1986. National design specifications. Washington D.C. 87 pp.nSheppard, I. 1969. An analytical and experimental investigation of contact area stress distribution and buckling strength of light gauge punched metal heel plates for timber trusses. Unpublished Ph.D. Thesis, Michigan State University.nSuddarth, S. K., and R. W. Wolfe. 1984. Purdue plane structures analyzer II: A computerized wood engineering system. General Technical Report FPL-40. USDA, Forest Products Lab, Madison, WI. 50 pp.nTriche, M. H., and S. K. Suddarth. 1988. Advanced design of metal-plate joints. Forest Prod. J. 38(9):7-12.nTruss Plate Institute. 1985. Design specifications for metal-plate connected wood trusses. Truss Plate Institute, Inc., Madison, WI.nVaroglu, E. 1984. Structural analysis of trusses and roof truss systems. Forintek Canada Corp., report to Canadian Forest Services.n
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