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Influence of glue rheology and joint thickness on the strength of bonded-in rods

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Abstract

The maximum pull-out strength of bonded-in rods was used for investigating the relationship between the joint geometry and the rheology of the structural adhesive. Tests with a brittle and a ductile glue type, both formulated with epoxy resins, showed that the glue rheology has a strong influence on the joint behaviour. The joint thickness is also an important parameter, having a good correlation with pull-out strength and with the fracture typology. Wood density and moisture content had a very low influence on strength, in these test conditions. A modification of the Eurocode 5 equation was developed, allowing an improved use of the adhesive properties for a safer design. Results suggest that a standardised test method for bonded-in rods would be very helpful for the determination of basic joint properties such as the maximum joint thickness and the glue strength parameter that were used in the modified design equation.

Zusammenfassung

Die maximale Ausziehfestigkeit von verklebten Stäben wurde verwendet, um die Beziehung zwischen der Verbindungsgeometrie und der Rheologie von Bauholzklebern zu untersuchen. Tests mit einem spröden und einem duktilen Klebertyp, beide aus Epoxidharz gebildet, zeigten, dass die Kleber-Rheologie einen starken Einfluss auf das Fugenverhalten hat. Die Fugendicke ist ebenfalls ein wichtiger Parameter, der eine gute Korrelation zur Ausziehfestigkeit und mit dem Bruchbild hat. Holzdichte und Feuchtigkeit haben unter diesen Testbedingungen einen sehr geringen Einfluss auf die Festigkeit. Eine Modifikation der Eurocode 5-Gleichung wurde entwickelt, die eine verbesserte Anwendung der Klebereigenschaften für eine sicherere Konstruktion erlaubt. Ergebnisse lassen darauf schließen, dass eine standardisierte Testmethode für Leimbinder sehr hilfreich für die Bestimmung von Grundverbindungseigenschaften wäre, wie beispielsweise die maximale Fugendicke und der Kleberfestigkeits-Parameter, die beide in der modifizierten Konstruktionsgleichung verwendet wurden.

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Authors and Affiliations

  1. Instituto per la Valorizzazione del Legno e delle Specie Arboree (CNR), Via Madonna del Piano, I-50019, Sesto Fiorentino, Italy

    L. Feligioni

  2. LegnoDOC srl, Via de' Bernardi 64, I-50145, Firenze, Italy

    P. Lavisci

  3. LERMAB-UMR INRA/ENGREF/UHP-ENSTIB N°1093, Equipe Génie Civil Bois, 27, rue du Merle Blanc, F-88051, Epinal, France

    G. Duchanois

  4. Mapei spa, Via Cafiero 22, I-20158, Milano, Italy

    M. De Ciechi

  5. Università di Firenze, Dipartimento di Ingegneria Civile, Via Santa Marta 3, I-50139, Firenze, Italy

    P. Spinelli

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  1. L. Feligioni
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  2. P. Lavisci
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  3. G. Duchanois
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  4. M. De Ciechi
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  5. P. Spinelli
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Correspondence to L. Feligioni.

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Feligioni, L., Lavisci, P., Duchanois, G. et al. Influence of glue rheology and joint thickness on the strength of bonded-in rods. Holz Roh Werkst 61, 281–287 (2003). https://doi.org/10.1007/s00107-003-0387-4

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  • DOI: https://doi.org/10.1007/s00107-003-0387-4

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