Shear Strength of Mexican Pine. II: Resistance Factor for LRFD
Publication: Journal of Structural Engineering
Volume 124, Issue 4
Abstract
Design values in shear parallel to the grain derived from tests on small clear specimens of Mexican pine are contrasted with values derived from an in-grade testing program carried out on full-width specimens. The former approach does not properly reflect the actual behavior of wood stressed in shear in elements of structural size. The process of deriving a resistance factor for probabilistic-based design is described. The inadequacy of the current target safety index values in the México City building code is briefly discussed.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
ASTM. (1983). “Standard method of testing small clear specimens of timber.”D 143-83, Philadelphia, Pa.
2.
ASTM. (1988). “Standard test methods for establishing clear wood strength values.”D 2555-88. Philadelphia, Pa.
3.
ASTM. (1992). “Standard practice for establishing structural grades and related allowable properties for visually graded lumber.”D 245-92, Philadelphia, Pa.
4.
Bárcenas-Pazos, G. M., and Dávalos-Sotelo, R. (1997). “Shrinkage characteristics of 105 Mexican woods.”J. Tropical Forest Products, Kuala Lumpur, Malaysia.
5.
Barrett, J. D., and Foschi, R. O. (1977). “Mode II stress intensity factors for cracked wood beams.”Engrg. Fracture Mech., 9(2) 371–378.
6.
Bury, K. V. (1975). Statistical models in applied science. John Wiley & Sons, Inc., New York, N.Y.
7.
Cramer, S. M., Goodman, J. R., Bodig, J., and Smith, F. W. (1984). “Failure modeling of wood structural members.”Struct. Res. Rep. No. 51, Civ. Engrg. Dept., Colorado State Univ., Fort Collins, Colo.
8.
Dávalos-Sotelo, R. (1996). probabilístico de estructuras de madera en Norte America.”Madera y Bosques, Xalapa, Ver., México, 2(1), 12–34 (in Spanish).
9.
Departamento del Distrito Federal (DDF). (1987a). Reglamento de construcciones para el distrito federal, Décima Edición. Editorial Porrúa, S.A., México, D.F., México (in Spanish).
10.
Departamento del Distrito Federal (DDF). (1987b). “Normas técnicas Complementaries para el diseo y construcción de estructuras de madera.”Gaceta Oficial del Departamento del Distrito Federal, Quinta Epoca No. 48, México, D.F., México (in Spanish).
11.
Dirección General de Normas (DGN). (1985). “Calificación y clasificación visual para madera de pino en usos estructurales.”Norma Mexicana NOM-C-239-1985. Secretaría de Comercio y Fomento Industrial, México, D.F., México (in Spanish).
12.
Echenique-Manrique, R., Dávalos-Sotelo, R., and Robles, F.-V. F. (1987). “Calificación y clasificación de la madera de pino para usos estructurales (Timber grading, México): Phase III.”Final Rep. to IDRC, INIREB, Xalapa, Ver. México (in Spanish).
13.
Ethington, R. L., Galligan, W. L., Montrey, W. L., and Freas, A. D. (1979). “Evolution of allowable stresses in shear for lumber.”Gen. Tech. Rep. FPL-23, U.S. Dept. of Agr., Forest Products Lab., Madison, Wis.
14.
Foschi, R. O.(1979). “A discussion on the application of the safety index concept in wood structures.”Can. J. Civ. Engrg., Ottawa, Canada, 6(1), 51–58.
15.
Foschi, R. O., and Barrett, J. D.(1976). “Longitudinal shear strength of Douglas-fir.”Can. J. Civ. Engrg., Ottawa, Canada, 3, 198–208.
16.
Foschi, R. O., Folz, B. R., and Yao, F. Z. (1989). “Reliability-based design of wood structures.”Struct. Res. Rep. No. 34, Dept. of Civ. Engrg., Univ. of British Columbia, Vancouver, Canada.
17.
Green, D. W., and Kretschmann, D. E. (1994). “Moisture content and the properties of clear Southern pine.”Res. Paper FPL-RO 531, U.S. Dept. of Agr., Forest Products Lab., Madison, Wis.
18.
“In-grade testing of structural lumber.” (1989). Proc. 47363, Forest Products Res. Soc., Madison, Wis.
19.
Keenan, F. J.(1974). “Shear strength of wood beams.”Forest Products J., 24(9), 63–70.
20.
Keenan, F. J., Kryla, J., and Kyokong, B.(1985). “Shear strength of spruce glued-laminated timber beams.”Can. J. Civ. Engrg., Ottawa, Canada, 12, 661–672.
21.
Longworth, J.(1977). “Longitudinal shear strength of timber beams.”Forest Products J., 27(8), 19–23.
22.
Madsen, B. (1992). Structural behavior of timber. Timber Engineering, Ltd., Vancouver, Canada.
23.
Madsen, B., and Nielsen, P. C. (1978). “In-grade testing investigation of test parameters in longitudinal shear.”Res. Rep. No. 23, Dept. of Civ. Engrg., Struct. Res. Series, Univ. of British Columbia, Vancouver, B.C., Canada.
24.
Meli, R. (1976). “Bases para los criterios de dise estructural del proyecto de reglamento de construcciones para el Distrito Federal.”Ingeniería, 46(2), México, D.F., México, 137–157 (in Spanish).
25.
Murphy, J. F. (1979). “Strength of wood beams with end splits.”Res. Pap. FPL 347, U.S. Dept. of Agr., Forest Products Lab., Madison, Wis.
26.
Murphy, J. F.(1988). “Mode II wood test specimen: Beam with center slit.”J. Testing and Evaluation, 16(4), 364–368.
27.
Ordóñez-Candelaria, V. R., and Dávalos-Sotelo, R.(1997). “Shear strength of Mexican pine. I: In-grade testing program.”J. Struct. Engrg., ASCE, 123(8), 1071–1078.
28.
Pearson, E. S., and Hartley, H. O. (1976). Biometrika tables for statisticians, Vol. 2, Biometrika Trust, University College, London, England.
29.
Quaile, A. T., and Keenan, F. J.(1978). “Shear strength of small composite beams.”Wood Sci., 11(1), 1–9.
30.
Radcliffe, B. M., and Suddarth, S. K.(1955). “The notched beam shear test for wood.”Forest Products J., 5(2), 131–135.
31.
Rammer, D. R., and Soltis, L. A. (1994). “Experimental shear strength of glued-laminated beams.”Res. Rep. FPL-RP-527, U.S. Dept. of Agr., Forest Products Lab., Madison, Wis.
32.
Rammer, D. R., Soltis, L. A., and Lebow, P. K. (1996). “Experimental shear strength of unchecked solid-sawn Douglas-fir.”Res. Rep. FPL-RP-553, U.S. Dept. of Agr., Forest Products Lab., Madison, Wis.
33.
Robles F.-V. F., Dávalos-Sotelo, R., and Ricalde-Camacho, M. O. (1988). “Comentarios a las normas Técnicas complementarias para dise y construcción de estructuras de madera versión 1987.”La Madera y su Uso, No. 15, INIREB-LACITEMA, Xalapa, Ver., México (in Spanish).
34.
Rosenblueth, E., and Esteva, L. (1972). “Reliability basis for some Mexican codes.”Probabilistic design of reinforced concrete buildings, American Concrete Inst., Detroit, Mich.
35.
Soltis, L. A., and Gerhard, T. D. (1988). “Shear design of wood beams: State of the art.”Gen. Tech. Rep. FPL-GTR-56, U.S. Dept. of Agr., Forest Products Lab., Madison, Wis.
36.
Wilson, T. R. C. (1932). “Strength moisture-relation for wood.”Tech. Bull. 282, U.S. Dept. of Agr., Forest Products Lab., Madison, Wis.
Information & Authors
Information
Published In
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Apr 1, 1998
Published in print: Apr 1998
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.