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Glued-in rods for timber structures—An experimental study of softening behaviour

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Abstract

A test method to obtain the strength and the fracture characteristics of the bond of glued-in rods for timber structures is presented. Test results from a series of tests using the proposed method are also given. The test method makes it possible to record the complete stress-displacement response of small test specimens. This response includes the softening behaviour after peak stress,i.e. the decreasing stress at increasing deformation. The test series include three adhesives, two rod-materials, four load-to-grain angles and two timber qualities with different densities. A method to evaluate the fracture-softening behaviour is also proposed. The fracture softening is evaluated by using only a part of the stress-displacement curve. The part used in the evaluation is determination in terms of the slope of the descending part of the stress-displacement curve.

Résumé

L’article traite d’une nouvelle méthode d’essai destinée à déterminer la résistance et les caractéristiques de rupture du joint de colle de barres collées, utilisées dans les constructions en bois. Les résultats d’une série d’essais effectués avec la méthode proposée sont également indiqués. La méthode d’essai permet de déterminer l’ensemble de la relation contrainte-déformation pour les petits échantillons. Cette relation comprend le comportement isoadoucissant après contrainte maximale, c’est-à-dire la réduction de la contrainte pendant l’augmentation de la déformation. La série d’essais porte sur trois types de colle, deux matériaux de barres, quatre différents angles entre charge et orientation des fibres, ainsi que deux qualités de bois différentes, de densités différentes. Une nouvelle méthode d’évaluation du comportement iso-adoucissant est également indiquée en utilisant seulement une partie de la courbe contrainte-déformation. La partie utilisée pour l’évaluation est déterminée par la pente de la partie descendante de la courbe contrainte-déformation.

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  1. Division of Structural Mechanics, Lund University, P.O. Box 118, SE-221 00, Lund, Sweden

    E. Serrano

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  1. E. Serrano
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Serrano, E. Glued-in rods for timber structures—An experimental study of softening behaviour. Mat. Struct. 34, 228–234 (2001). https://doi.org/10.1007/BF02480593

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  • DOI: https://doi.org/10.1007/BF02480593

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