Page 8 - InnoRenew CoE International Conference 2021, Healthy and Sustainable Renovation with Renewable Materials
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perimental investigations of innovative seismic-resistant CLT connections
Boris Azinović 1, Meta Kržan 1, Andreja Pondelak 1, Jaka Gašper Pečnik 2, Vaclav Sebera 2, Igor
Gavrić 2, Iztok Šušteršič 2
1. Slovenian National Building and Civil Engineering Institute; Dimičeva ulica 12, 1000 Ljubljana; boris.azinovic@zag.si, meta.krzan@
zag.si, andreja.pondelak@zag.si
2. InnoRenew CoE; Livade 6, 6310 Izola; jaka.pecnik@innorenew.eu, vaclav.sebera@innorenew.eu, igor.gavric@innorenew.eu,
iztok.sustersic@innorenew.eu
The behaviour of cross-laminated timber (CLT) buildings during earthquakes depends mainly on the
behaviour of the connections between adjacent panels. If the connections between the panels are
strong enough, these structures can achieve damage-free performance even during strong earthquakes.
However, amplified seismic accelerations associated with rigid connections may result in occupant’s
injury and contents damage which is not acceptable in terms of serviceability. To improve the ductile
behaviour of CLT buildings, several solutions of dissipative connections have been proposed in recent
years, mainly by modifying conventional mechanical connections.
The main aim of the contribution is to present three different concepts of CLT connections examined in
terms of their cyclic response:
1) Connections with flexible polyurethane-based adhesives. The main idea of the proposed solution is to
dissipate seismic energy through the adhesive joints between timber elements. A flexible adhesive could
be employed at the vertical joints between adjacent panels or at the interface of glued-in rods which can
be used to connect various elements (e.g. foundations and walls).
2) Weakened dowel-type fasteners. The concept of the solution is to weaken the dowels at the pre-
determined locations and thus provide a controlled ductile response of the connections. Such connection
could be used at different locations, e.g. as foundation-to-wall or wall-to-wall connection.
3) Steel angle brackets with PUR isolation. The isolated angle brackets have already been previously
developed (by companies Getzner and Pitzl) to reduce vibration and improve sound isolation of buildings.
The cyclic response of angle bracket connections was investigated and based on the results some
improvements were given for the use of connections in seismic areas.
Keywords: cross-laminated timber (CLT), connections, cyclic tests, polyurethane, flexible adhesive,
isolation
Acknowledgement
The authors gratefully acknowledge the European Cooperation in Science and Technology for funding
the InnoRenew CoE project [grant agreement #739574] under the H2020 Spreading Excellence and
Widening Participation Horizon2020 Widespread-Teaming program, and Slovenian research program
P2-0273; ARRS.
INNORENEW COE INTERNATIONAL CONFERENCE 2021
8
Boris Azinović 1, Meta Kržan 1, Andreja Pondelak 1, Jaka Gašper Pečnik 2, Vaclav Sebera 2, Igor
Gavrić 2, Iztok Šušteršič 2
1. Slovenian National Building and Civil Engineering Institute; Dimičeva ulica 12, 1000 Ljubljana; boris.azinovic@zag.si, meta.krzan@
zag.si, andreja.pondelak@zag.si
2. InnoRenew CoE; Livade 6, 6310 Izola; jaka.pecnik@innorenew.eu, vaclav.sebera@innorenew.eu, igor.gavric@innorenew.eu,
iztok.sustersic@innorenew.eu
The behaviour of cross-laminated timber (CLT) buildings during earthquakes depends mainly on the
behaviour of the connections between adjacent panels. If the connections between the panels are
strong enough, these structures can achieve damage-free performance even during strong earthquakes.
However, amplified seismic accelerations associated with rigid connections may result in occupant’s
injury and contents damage which is not acceptable in terms of serviceability. To improve the ductile
behaviour of CLT buildings, several solutions of dissipative connections have been proposed in recent
years, mainly by modifying conventional mechanical connections.
The main aim of the contribution is to present three different concepts of CLT connections examined in
terms of their cyclic response:
1) Connections with flexible polyurethane-based adhesives. The main idea of the proposed solution is to
dissipate seismic energy through the adhesive joints between timber elements. A flexible adhesive could
be employed at the vertical joints between adjacent panels or at the interface of glued-in rods which can
be used to connect various elements (e.g. foundations and walls).
2) Weakened dowel-type fasteners. The concept of the solution is to weaken the dowels at the pre-
determined locations and thus provide a controlled ductile response of the connections. Such connection
could be used at different locations, e.g. as foundation-to-wall or wall-to-wall connection.
3) Steel angle brackets with PUR isolation. The isolated angle brackets have already been previously
developed (by companies Getzner and Pitzl) to reduce vibration and improve sound isolation of buildings.
The cyclic response of angle bracket connections was investigated and based on the results some
improvements were given for the use of connections in seismic areas.
Keywords: cross-laminated timber (CLT), connections, cyclic tests, polyurethane, flexible adhesive,
isolation
Acknowledgement
The authors gratefully acknowledge the European Cooperation in Science and Technology for funding
the InnoRenew CoE project [grant agreement #739574] under the H2020 Spreading Excellence and
Widening Participation Horizon2020 Widespread-Teaming program, and Slovenian research program
P2-0273; ARRS.
INNORENEW COE INTERNATIONAL CONFERENCE 2021
8
