Conference paper Open Access
Boris Azinović; Andreja Pondelak; Jaka Gašper Pečnik; Vaclav Sebera
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 6
mm 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.