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A Discussion on the Introduction of Wood to the JCSS probabilistic model code

A Discussion on the Introduction of Wood to the JCSS probabilistic model code. Tomi Toratti, Alpo Ranta-Maunus. Background. Only the lower tail of strength distribution necessary for the reliability analysis The lower tails of different distibution functions are different.

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A Discussion on the Introduction of Wood to the JCSS probabilistic model code

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

  2. 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)/

  3. ,05 ,05 Normal Normal Machine sorted Machine sorted ,04 ,04 All data Tail data ,03 ,03 ,02 ,02 ,01 ,01 0,00 0,00 15 20 25 30 35 15 20 25 30 35 ,05 Lognormal Lognormal Machine sorted ,04 Machine sorted All data Tail data ,03 ,02 ,01 0,00 15 20 25 30 35 COV = 21 % COV = 17 % ,05 ,04 ,03 COV = 23 % COV = 27 % ,02 ,01 0,00 15 20 25 30 35

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

  5. COV for other strength distributions

  6. 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 Use of the JCSS model code

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