CIB-W18 Timber Structures – A review of meeting 1-43 2 MATERIAL ...
CIB-W18 Timber Structures – A review of meeting 1-43 2 MATERIAL ...
CIB-W18 Timber Structures – A review of meeting 1-43 2 MATERIAL ...
- TAGS
- timber
- structures
- cib-w18.com
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
y assuming a normal distribution. EN 1<strong>43</strong>58 follows basically the same<br />
approach as ISO 12491, but assuming a log-normal distribution and an unknown<br />
coefficient <strong>of</strong> variation.<br />
The investigations show that EN 1<strong>43</strong>58 and EN 384 give the same results.<br />
If only one European standard is maintained, one suggests that EN<br />
1<strong>43</strong>58 is kept, since it is applicable to all wood-based products and that it<br />
is much easier to i use. We should only slightly modify it in order to have<br />
a minimum sampling (e.g. 200 specimens, made <strong>of</strong> 5 distinct samples).<br />
Despite ISO 12491 is applicable to all building materials, we suggest<br />
not to use it, since it gives a big scatter.<br />
In ISO 13910, there is an equivalence factor with EN 384, which varies<br />
from 1,0 to 1,3, depending on the strength property, the size and the quality<br />
<strong>of</strong> timber, taking into account different test methods. Our simulations<br />
show that the way <strong>of</strong> calculating the fifth percentiles gives another correction<br />
factor, which encounters the previous one. By combining both factors,<br />
we could use a straightforward correspondence between both standards.<br />
Conclusions<br />
The investigations show that EN 1<strong>43</strong>58 and EN 384 give the same results.<br />
If only one European standard is maintained, one suggests that EN 1<strong>43</strong>58<br />
is kept, since it is applicable to all wood-based products and that it is much<br />
easier to use. We should only slightly modify it in order to have a minimum<br />
sampling (e.g. 200 specimens, made <strong>of</strong> 5 distinct samples).<br />
Despite ISO 12491 is applicable to all building materials, we suggest<br />
not to use it, since it gives a big scatter.<br />
In ISO 13910, there is an equivalence factor with EN 384, which varies<br />
from 1,0 to 1,3, depending on the strength property, the size and the quality<br />
<strong>of</strong> timber, taking into account different test methods. Our simulations<br />
show that the way <strong>of</strong> calculating the fifth percentiles gives another correction<br />
factor, which encounters the previous one. By combining both factors,<br />
we could use a straightforward correspondence between both standards.<br />
<strong>CIB</strong>-<strong>W18</strong> <strong>Timber</strong> <strong>Structures</strong> <strong>–</strong> A <strong>review</strong> <strong>of</strong> <strong>meeting</strong> 1-<strong>43</strong> 2 <strong>MATERIAL</strong> PROPERTIES page 2.111