Timber Column in Concrete & Uplift & IBC

[jgeng]

I have an elevated timber structure supported on 4x4 timber colums. The columns were embedded in concrete. I want to analyze the overturning of the structure due to the windloading. The way I look at it I have the dead weight of the timber structure + the concrete weight resisting the overturning moment in each orthoganol direction. My question is do most assume the friction between the timber and concrete is enough to act together? is there a calc check to see if friciton controls? If you can't count on friction do you have to have a mechanical connection? a simpson connector? I have seen a bunch of nails detailed out on the timber to be embedded? Does the IBC address/permit this as a foundation type? Thanks!

 

[MiketheEngineer]

I think it is in Section 18.

 

[efsinc]

if i am understanding your question properly, i cannot think there is any reliable 'friction' between the timber and the concrete. a slight movement during curing would break a bond. over time timber will generally shrink as it dries.