Glulam Mechanical Characterization


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The glued laminated timber (glulam) mechanical properties may be evaluated through the determination of the key mechanical properties of the lamellae that compose that element. Simple bending and tension parallel to the grain tests were performed in order to assess the strength class of three glulam elements. Regarding the bending tests, 8 samples were taken from a glulam beam and assessed. Values for the resistant bending tension and both local and global modulus of elasticity were obtained. For the tension parallel to the grain tests, a total of 120 samples were assessed. The samples were divided regarding the structural element from where they were extracted as well to the type of failure mode found in the tests. The values of the lamellae properties were then used for determination of the properties of the glulam material. The data gathered from the tests was assessed statistically and concluded that the mechanical properties of the glulam elements did not fulfill the required parameters of the normative requirements.



Materials Science Forum (Volumes 730-732)

Edited by:

Ana Maria Pires Pinto and António Sérgio Pouzada






H. S. Sousa et al., "Glulam Mechanical Characterization", Materials Science Forum, Vols. 730-732, pp. 994-999, 2013

Online since:

November 2012




[1] J.J. Lee, G.C. Kim, Study on the estimation of the strength properties of structural glued laminated timber I: determination of optimum MOE as input variable, J. Wood Sci (2000) 46: 115-121.

DOI: 10.1007/bf00777357

[2] R.C. Moody, R. Hernandez, Engineered wood products - A guide for specifiers, designers and users, in: Smulsky, Stephen (Eds), Chapter 1: Glued-Laminated Timber, PFS Research Foundation, Madison, 1997, pp.1-39.

[3] A. Freas, M. Selbo, Fabrication and design of glued-laminated wood structural members, Technical Bulletin No. 1069, U.S. Department of Agriculture (1954).

[4] R. Hernandez, D.A. Bender, B.A. Richburg, Probabilistic modeling of glued-laminated timber beams, Wood and Fiber Science (1992) 294-306.

[5] NP EN 1194: 1999, Estruturas de Madeira - Madeira lamelada-colada - Classes de resistência e determinação dos valores característicos, IPQ (in Portuguese) (1999).

[6] P. Kuklík, L. Melzerová, Variability of Modulus of Elasticity in glued laminated timber beams, SHATIS'11, Lisbon, Portugal (2011).

[7] J.J. Lee, J.S. Park, K.M. Kim, J.K. Oh, Prediction of bending properties for structural glulam using optimized distributions of knot characteristics and laminar MOE, J. Wood Sci. (2005) 51: 640-647.

DOI: 10.1007/s10086-005-0704-0

[8] EN 408: 2003, Timber structures - Structural timber and glued laminated timber - Determination of some physical and mechanical properties, European Committee for Standardization (2003).

DOI: 10.3403/30159970

[9] ISO 3130: 1975, Wood - Determination of moisture content for physical and mechanical tests, International Organization for Standardization (1975).

[10] ISO 3131: 1975, (1975), Wood - Determination of density for physical and mechanical tests, International Organization for Standardization (1975).

[11] E. Herawati, M.Y. Massijaya, N. Nugroho, Performance of glued-laminated beams made from small diameter fast-growing tree species, J. Biological Sciences (2010) 37-42.

DOI: 10.3923/jbs.2010.37.42

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