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1.
Flexible polymer connections for clt structures
Boris Azinović, Andreja Pondelak, Jaka Gašper Pečnik, Václav Sebera, 2020, objavljeni znanstveni prispevek na konferenci

Povzetek: This paper explores the possibility of using flexible polymer adhesives to dissipate energy in CLT buildings during earthquakes. In the first series of tests, pull-off tests of various polyurethane (PUR) adhesives were performed. The connection was tested in pull-pull configuration using monotonic, tension-only loading. The tests have shown that the adhesive can resist large deformations already in tension loading and with small thicknesses of the bond-line. Based on the pull-off test results, one adhesive has been selected for further testing. Monotonic lap-shear tests were performed with the selected adhesive and thick bond-line (3 mm and 6 mm). The results show, that the standard method for lap-shear testing (EN 205) needs to be adapted for thick glue-line. It was found that the strength of 3 mm glue-line is higher than 6mm one, which is in agreement with adhesion theory. The flexible PUR adhesives could potentially be used in CLT structures for anchoring the CLT wall with “flexible” glued-in rods or as a “flexible” vertical shear connection between the CLT walls. Such systems have a potential to dissipate energy in seismic areas.
Ključne besede: CLT connections, flexible adhesive, polyurethane, energy dissipation, pull-off, lap-shear
Objavljeno v DiRROS: 19.01.2024; Ogledov: 178; Prenosov: 81
.pdf Celotno besedilo (18,89 MB)
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2.
Mechanical performance of timber connections made of thick flexible polyurethane adhesives
Jaka Gašper Pečnik, Igor Gavrić, Václav Sebera, Meta Kržan, Arkadiusz Kwiecień, BogusŁaw Zając, Boris Azinović, 2021, izvirni znanstveni članek

Povzetek: This study investigates timber connections with flexible polyurethane adhesives, which prove to have the po-tential for timber-adhesive composite structures without mechanical connections for seismic regions. Results of conducted cyclic double lap-shear adhesive timber joints tests were compared with available experimental re-sults on timber connections with standard mechanical dowel-type fasteners and with results of numerical finite element analysis. The study found that the shear strength, elastic stiffness and strength degradation capacity of the flexible adhesive connections were significantly higher compared to mechanical fasteners commonly used in seismic-resistant timber connections. The latter, however, manifested larger ultimate displacements but also yielded at lower displacements.
Ključne besede: flexible adhesive, timber connection, polyurethane, double lap-shear, cyclic loading, energy dissipation, open access
Objavljeno v DiRROS: 19.05.2023; Ogledov: 385; Prenosov: 249
.pdf Celotno besedilo (5,16 MB)
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