Experimental study comparing the behaviour of steel truss plates and birch plywood inserts in ridge joints on glued laminated rafters

Authors

  • M. A. Serrano López Universidad de Oviedo
  • A. G. Lozano Martínez-Luengas Universidad de Oviedo
  • F. López Gayarre Universidad de Oviedo
  • J. J. Del Coz Díaz Universidad de Oviedo

DOI:

https://doi.org/10.3989/mc.2009.44407

Keywords:

laminated timber, mechanical joints, steel fittings, plywood, flexural strenght

Abstract


The present paper reports on an analysis of the mechanical performance of two flat joining systems used in roof members made of glued laminated timber.

Six pairs of laminated timber rafters for a double-pitched roof with a 100x180-mm cross-section, a 6.00-m span and a height of 1.00 m were subjected to full-scale four-point bending. In three of the specimens the rafters were joined at the ridge with a birch plywood insert, while in the other three the connection was secured with a fitting consisting in a standard flat steel truss plate. The objective pursued was to evaluate the possibility of replacing the steel fittings with birch plywood inserts. The approach adopted to reach this objective was to compare the strength of the two joint pieces and the deformation generated in the overall structure during strength tests.

The results proved to be highly satisfactory in terms of both the bearing capacity and the stiffness of the structures tested.

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References

(1) Arriaga, F.; Argüelles, R.: “Estructuras de Madera. Diseño y cálculo”. AITIM (2000).

(2) Ross, P.; O. Arup.: “Appraisal and repair of timber structures”. ASCE. Thomas Telford Ltd. (2002).

(3) Harada, M.; Hayashi, T.; Karube, M.; Lida A.; Komatsu, K.: “Static loading tests of glued laminated timber joints with drift pins. –The effect of MOE on anisotropy of mechanical property. Joints in timber structures”. RILEM proceedings pro022 (2001).

(4) Branco, J.; Cruz, P.; Piazza, M.; Varum, H.: “Experimental analysis of original and strengthened traditional timber connections”. 9th World Conference on Timber Engineering. Portland (2006).

(5) Manual del contrachapado Finlandés. WISA, Lahtí. Finlandia (2006).

(6) EN 789:04. “Timber structures - Test methods - Determination of mechanical properties of wood based panels”. CEN/TC 124 (2004).

(7) UNE-EN 595:96. “Estructuras de madera. Ensayo para la determinación de la resistencia y rigidez de las cerchas” (1996).

(8) EN 1995-1-1. “Eurocode 5: Design of timber structures. Part 1-1: General-Common rules and rules for buildings” (2004).

(9) CTE-DB SE-M. “Código Técnico de la Edificación. Documento Básico de Seguridad Estructural: Madera”. Libro 6. Ministerio de Vivienda (2006).

(10) UNE-EN 385:02. “Empalmes por unión dentada en madera estructural. Especificaciones y requisitos mínimos de fabricación” (2002).

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Published

2009-09-30

How to Cite

Serrano López, M. A., Lozano Martínez-Luengas, A. G., López Gayarre, F., & Del Coz Díaz, J. J. (2009). Experimental study comparing the behaviour of steel truss plates and birch plywood inserts in ridge joints on glued laminated rafters. Materiales De Construcción, 59(295), 45–59. https://doi.org/10.3989/mc.2009.44407

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Section

Research Articles