Published September 24, 2021 | Version v1
Journal article Open

Mechanical performance of timber connections made of thick flexible polyurethane adhesives

  • 1. University of Primorska
  • 2. InnoRenew CoE
  • 3. Slovenian National Building and Civil Engineering Institute
  • 4. Cracow University of Technology


This study investigates timber connections with flexible polyurethane adhesives, which prove to have the potential
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 results
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.



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InnoRenew CoE – Renewable materials and healthy environments research and innovation centre of excellence 739574
European Commission