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Strength determination and durability of load-bearing timber-glass-structures

: Fecht, Simon; Milchert, L.; Grunwald, Cordula; Vallée, Till

University of Porto, Faculty of Engineering -FEUP-:
AB 2015, 3rd International Conference on Structural Adhesive Bonding. Book of abstracts : 2-3 July 2015, Porto, Portugal
Porto, 2015
ISBN: 978-989-723-135-3
International Conference on Structural Adhesive Bonding (AB) <3, 2015, Porto>
Fraunhofer IFAM ()

In timber engineering, the combination with other materials in form of hybrid structures usually leads to stiffer and stronger, therefore more efficient structures [1]. The use of glass in timber construction is a promising combination of materials, which leads to functional and aesthetic products. Joining these two materials is made possible by the use of adapted adhesives, which ensure a load transfer with no mechanical weakening of the glass panels due to drill-holes. Furthermore, glass is a brittle material, and timber is able to achieve a certain redundancy of the structure [2]. Timber, glass and adhesive are materials differing in their mechanical properties, thermal expansion, hygroscopic adsorption and failure behavior; the differences in all these parameters have an influence on the long term durability of constructions. In order to shed light on the behavior of glass-timber compound under environmental loads, different strength determination methods were performed on small and large scale probes. The measurement to place after exposure to temperature (from -20 °C to +80 °C) and humidity(from 60% to 100% rel. hum.) Three different timber species were considered (spruce, beech and oak), and combined with float- and pre-stressed glass using different adhesives. The investigation outlines various aspects on what to consider when bonding wood and glass, and allows for a better understanding of this type of hybrid structural element.