Up until now I have been using the "allowable" stress values shown in the NDS tables included in the Timber Frame Design book in my structural models.

I note that the values shown, for example, ultimate horizontal shear in the Wood Handbook are between 10 to 20 times higher.

I am currently working with a client who is required to use limit state analysis and this seems to permit allowable stresses to rise higher than NDS allowable.

Can anybody shed some light on this please ?

Regards
Ken Hume http://www.clik.to/WorldofWood
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Looking back to see the way ahead !