1. Tomi Toratti, Alpo Ranta-Maunus
A Discussion on the Introduction of Wood to the JCSS probabilistic model code
Tomi Toratti, Alpo Ranta-Maunus

2. The lower tails of different distibution functions are different
Background
Only the lower tail of strength distribution necessary for the reliability analysis
The lower tails of different distibution functions are different
A summary of existing strength data based on the Nordic Wood project on the reliability of timber structures, /Ranta-Maunus (2001)/

5. COV = 21 % COV = 17 % COV = 23 % COV = 27 % Normal Normal Tail data35 30 25 20 15
,05
,04
,03
,02
,01
0,00
Normal
All data
Machine sorted 35 30 25 20 15
,05
,04
,03
,02
,01
0,00
Normal
Tail data
Machine sorted
COV = 21 %
COV = 17 % 35 30 25 20 15
,05
,04
,03
,02
,01
0,00
Lognormal
All data
Machine sorted
,05
Lognormal
Tail data
Machine sorted
,04
,03
COV = 23 %
COV = 27 %
,02
,01
0,00 15 20 25 30 35

7. * Paper by Ranta-Maunus suggests a lower tail-COV for C40

8. COV for other strength distributions

9. Use of the JCSS model code
Structural designers
Design on unique structures
Assessment of old structures or old designs
Often designers complain that the design of wood structures is too complicated
Researchers
Used usually to verify parameters of deterministic codes
Product development
Assessment of old structures