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  1. 29th May 2010, 10:35 PM #1
    xrcuta
    xrcuta is offline New Member
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    Default How is the safety factor of timber derived

    Hi all im new to this board. Im a student seeking some advice in regards to a report im doing on timber for school.

    The question ive got stuck on is, How is the safety factor of timber derived ?

    can anyone shine some light my way ... would be much appreciated.


    cheers
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  3. 30th May 2010, 09:43 AM #2
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    steck
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    If you mean Stress Gradings they are determined by
    Bending,
    Tension parallel to grain
    Shear in beam
    Compression parallel to grain
    Characteristic short duration average modulus of elasticity parallel to grain
    Characteristic short duration average modulus of rigidity
    There is a pretty good table with figures at:
    Timber and Timber Products General Requirements : Electronic Blueprint Building Specifications KnowledgeBase
    And an explanation here: Education - Grading

    Hope this helps!
    Cheers,
    Steck
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  4. 30th May 2010, 09:57 PM #3
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    joe greiner
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    Safety factor is mostly an uncertainty factor. Uncertainty arises from real loads vs. design loads, variation in material properties, construction errors, and even methods of design analysis - which are usually only a convenient fiction to simulate real conditions.

    Cheers,
    Joe
    Of course truth is stranger than fiction.
    Fiction has to make sense. - Mark Twain
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  5. 1st June 2010, 12:40 PM #4
    xrcuta
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    thanks guys for the feedback.

    Steck you actually answered another of my questions on my report. much appreciated


    Joe you were rite on the money with what was needed in my response to the initial question.

    Cheers
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