Assessment of the Glue-Line Quality in Glued Laminated Timber Structures

Abstract:

Timber constructions with glulam members have regularly to be proofed for their performance to avoid structural collapse. For the assessment of glued laminated timber, it is important to know reliable methods and criteria. The requirements given in standard EN 386:2001 are valid for the quality control of the glulam production. The use and application of these two different methods at existing timber structures were investigated and discussed. The experimental test series comprise different adhesives as well as specimen from new material and existing structures. Problems and issues noted during the test series and analyses of the results are discussed. The correlations found provide advice for the assessment of existing structures.

• Periodical: Advanced Materials Research (Volume 778)
• Pages: 424-431
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.778.424
• Online since: September 2013
• Authors: Bettina Franke, Florian Scharmacher, Andreas Müller
• Keywords: Assessment, Delamination Test, Glue Lines, Glulam, Shear Test

References

[1] F. Gaspar, A. Gomes, H. Cruz, Assessment of natural and artificial ageing of glued laminated timber. Core drilling, shear and delamination tests. World Conference on timber engineering, Itlay, (2010).

[2] T. Tannert, T. Vallée, A. Müller, Critical review on the assessment of glulam structures using shear core samples, Journal Civil Structural Health Monitoring (2012) 2, 65-72.

DOI: 10.1007/s13349-012-0016-1

[3] G. Dill-Langer, Detektion von Fehlverklebungen – Forschungsergebnisse und Praxisrelevanz, 2. Stuttgarter Holzbau-Symposium, Germany, (2012).

[4] M. Sanabria, J. Sergio, Air-coupled ultrasound propagation and novel non-destructive bonding quality assessment of timber composites, doctoral and habilitation theses, ETH-Zuerich, Switzerland, (2012).

[5] European Committee for Standardization (CEN), EN 386: 2001, Glued laminated timber, Performance requirements and minimum production requirements, Brussels, (2001).

DOI: 10.3403/00568065u

[6] European Committee for Standardization (CEN), EN 391: 2001, Glued laminated timber, Delamination test of glue lines, Brussels, (2001).

DOI: 10.3403/02484616

[7] European Committee for Standardization (CEN), EN 392: 1995, Glued laminated timber, Shear test of glue lines, Brussels, (1995).

DOI: 10.3403/00547163

[8] European Committee for Standardization (CEN), EN 408: 2010, Timber structures, Structural timber and glued laminated timber, Determination of some physical and mechanical properties, Brussels, (2010).

DOI: 10.3403/30159970

[9] H. J. Blass, J. Denzler, M. Frese, P. Glos, P. Linsemann, Biegefestigkeit von Brettschichtholz in Buche, Publisher University of Karlsruhe, Germany (2005).

[10] A. Frühwald, J. B. Ressel, P. Becker, C.M. Pohlmann, R. Wonnemann, Verwendung von Laubhölzern zur Herstellung von Leimholzelementen, research report, University Hamburg, Germany, (2003).

[11] Information on http: /www. grupo-gamiz. com/en/0202. html, 13/02/(2013).

[12] European Committee for Standardization (CEN), EN1995-1-1: 2004, Eurocode 5, Design of timber structures - General - Common rules and rules for buildings, Brussels, (2004).

DOI: 10.3403/03174906

[13] G. Zeppenfeld, D. Grundwald, Klebstoffe in der Holz- und Möbelindustrie, DRW-Verlag Weinbrenner, Leinfelden Echterdingen, (2005).

[14] R. Steiger, W. Risi, Qualitätskontrolle von Brettschichtholz: Vergleich der Prüfverfahren Blockschertest und Delaminierungstest, research report, Empa, Duebendorf, Switzerland, (2011).

[15] M. Schmidt, P. Glos, G. Wegener, Verklebung von Buchenholz für tragende Holzbauteile, European Journal Wood Production (2010) 68, 43-57.

DOI: 10.1007/s00107-009-0382-5