Alghero, no. 44, 2011 - CIB-W18

44 - 15 - 7 Seismic Performance of Cross-Laminated Wood Panels - M Popovski,
E Karacabeyli
Presented by M Popovski
A Buchanan stated that this work made comparisons between CLT and light wood frame
systems. In case of light wood frame system there are many nail connectors helping the
structure resist the lateral forces. In CLT only few hold down and brackets devices were
available such that the entire system relied on few connectors. For CLT case with a nail
strip, it is more similar to the light frame wall but still not the same. A Buchanan stated
that more care would be needed to treat the CLT system. M Popovski agreed and stated in
general CLT system connections are more localized but there can still be a lot of nail
available.
B Dujic S Pampanin and M Popovski discussed where sliding occurred in the load CLT
walls.
A Ceccotti asked about the equivalent viscous damping. M Popovski answered that it was
not calculated yet.
I Smith stated that in Canada the type of building for CLT use is still unknown and 2015
target for CLT information to be in the Canadian CSA code might be too optimistic.
44 - 15 – 8 Evaluation of Plywood Sheathed Shear Walls with Screwed Joints Tested
According to ISO 21581 - K Kobayashi, M Yasumura
Presented by K Kobayashi
F Lam received confirmation that the calibration of the hysteresis rules for the model was
based on single connection test results.
E Serrano asked about the single spring model and the influence of load direction in
relation to wood grain. K Kobayashi responded that test results corresponding to
perpendicular to grain direction was used and there could be influence from grain direction
but was not considered in the study.
J Munch-Andersen asked about the brittle fracture of the screws and how much bending of
the screws was experienced. K Kobayashi responded that in monotonic tests the single
screws seemed ductile.
44 - 15 – 9 Influence of Connection Properties on the Ductility and Seismic Resistance of
Multi-Storey Cross-Lam Buildings - I Sustersic, M Fragiacomo, B Dujic
Presented by I Sustersic
I Smith and I Sustersic discussed that estimating the lower strength such as 5 th percentile
would be easier than estimating the higher end strength and its relationship with over
strength factor.
8 FIRE
44 - 16 - 1 Gypsum Plasterboards and Gypsum Fibreboards – Protective Times for Fire
Safety Design of Timber Structures – A Just, J Schmid, J König
Presented by A Just
A Frangi commented that the ETH data on start time of charring t ch was based on mean
values and the proposed equation here was very conservative. He questioned whether one
would need to go with such high level of conservatism. He also question how the 1%
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