Naslov
Short-Term Analysis of Adhesive Types and Bonding Mistakes on Bonded-in-Rod (BiR) Connections for Timber Structures

Autori
Barbalić, Jure ; Rajčić, Vlatka ; Bedon, Chiara ; Budzik, Michal K.

Izvornik
Applied Sciences-Basel (2076-3417) 11 (2021), 6; 2665, 18

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
bonded-in rod (BiR) connections ; adhesives ; fracture modes ; moisture ; experiments ; linear elastic fracture mechanics (LEFM) ; analytical model

Sažetak
Bonded-in rods (BiR) represent a structural connection type that is largely used for new timber structures and rehabilitation (repair or reinforcement) of existing structural members. The technology is based on steel / Fiber Reinforced Polymer (FRP) / Glass Fiber Reinforced Polymer (GFRP) rods bonded into predrilled holes in timber elements. The mechanical advantages of BiRs include high local force capacity, improved strength, a relatively high stiffness and the possibility of ductile behaviour. They also offer aesthetic benefits, given that rods are hidden in the cross sections of wooden members. As such, BiR connections are regarded as a solution with great potential, but still uncertain design formulations. Several research projects have dealt with BiRs, but a final definition of their mechanics and a universal design procedure is still missing. This research study explores the typical fracture mechanics modes for BiR connections. A special focus is given to the evaluation of the impact of adhesive bonds under various operational conditions (i.e., moisture content of timber). A total of 84 specimens are tested in pull-out setup, and investigated with the support of digital image correlation (DIC). The reliability of empirical equations and a newly developed analytical model in support of design, based on linear elastic fracture mechanics (LEFM), is also assessed.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Strojarstvo, Temeljne tehničke znanosti, Interdisciplinarne tehničke znanosti

Napomena
The EU-COST Action CA18120 is gratefully
acknowledged for providing financial support
to the first and third authors (J.B. visitor at
Aarhus University, Denmark and C.B. visitor at
University of Zagreb, Croatia), in the framework
of CertBond Short Term Scientific Missions - STSM
grants.

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