Double‐lap shear tests on steel‐timber glued connections at elevated temperatures
Abstract
Abstract This paper presents the results of an experimental campaign comprising nearly 30 double‐lap shear tests on steel–timber glued connections conducted at ambient conditions and at temperatures up to 150 °C. Small‐scale specimens made of structural steel (S355) plates and glued laminated timber (GL24h) were bonded using a one‐component polyurethane (PUR) adhesive. The samples were tested in an electric furnace integrated into a universal testing machine, enabling displacement‐controlled loading at a predefined steady‐state temperature using a calibrated testing protocol. The results confirm a strong temperature‐dependent degradation of mechanical performance, in terms of both shear strength and stiffness. These decreased progressively with increasing temperature, with significant drop between 20°C and 90 °C. The load–slip response remained predominantly linear until brittle failure occurred. At ambient temperature, most specimens exhibited local shear failure of the timber lamella combined with adhesive failure at the steel–adhesive interface. The latter failure mode became predominant at higher temperatures, indicating deterioration of the chemical bond at the steel surface. To overcome this issue, sandblasting was applied in two test series, resulting in enhanced strength under ambient conditions. However, only a modest improvement was observed at elevated temperatures.
Reference
Valentino Vigneri; Simon Rohrbach; Aurélien Vuffray; Andreas Taras. (2026). Double‐lap shear tests on steel‐timber glued connections at elevated temperatures. ce/papers. https://doi.org/10.1002/cepa.70694
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