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Author(s):	Sahellie, Samer; Pasternak, Hartmut
Title:	Epoxy- and acrylic-bonded joints for strengthening lightweight steel girders
Abstract:	Several attempts have been made to introduce the adhesive bonding technique into steel construction, showing that this technique is promising and could replace traditional joining methods such as bolts, rivets and welding. Epoxy adhesive is used for structural joints more than acrylic due to its advanced properties such as its high capacity and its relatively good resistance to aging and environmental effects when compared with acrylic. The following paper briefly shows the difference between the use of epoxy and acrylic adhesives when bonding steel plates to strengthen lightweight cold-formed galvanized steel girders. The thickness of the adhesive layers is 0.65 mm. Strengthened girders were tested experimentally at room temperature (20 °C) in 3-point bending tests and numerically investigated at -20 °C and 40 °C. The results show the efficiency of the bonded strengthening joints and that acrylic has an advantage in that it can absorb the deformations of the ductile steel without breaking. Verstärkung von Stahlleichtbauprofilen durch Epoxid- und Acrylat-Klebverbindungen. Bei der Untersuchung von Klebverbindungen im Stahlleichtbau hat sich gezeigt, dass diese Technik erfolgversprechend ist und die traditionellen Fügetechniken, wie Schrauben, Nieten und Schweißen, ersetzen kann. Epoxidklebstoff wird bei Stahlverbindungen häufiger verwendet als Acrylatklebstoff, da dieser bessere Eigenschaften wie hohe Festigkeit, relativ gute Alterungsbeständigkeit und Umweltauswirkungen hat. Der Beitrag zeigt am Beispiel der Verstärkung eines verzinkten Stahlleichtbauprofils den Unterschied zwischen Epoxid- und Acrylatklebstoffen. Die Dicke der Klebstoffschicht beträgt 0,65 mm. Der verstärkte Träger wird bei Raumtemperatur (20 °C) im 3-Punkt-Biegeversuch getestet und numerisch bei Temperaturen von -20 °C und 40 °C simuliert. Die Ergebnisse zeigen, dass die durch Kleben verstärkte Verbindung effektiv ist. Acrylat-Klebverbindungen haben den Vorteil, dass sie die Verformungen des duktilen Stahls ohne Bruch aufnehmen können.
Source:	Stahlbau 84 (2015), No. 8
Page/s:	577-583
Language of Publication:	English

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