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Re: Timber floor framing

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As we have previously discussed, the Western Woods Use Book covers this topic in some detail.  When laid perpendicular, the shear capacity is developed by means of a moment couple at each pair of fasteners in each board at each joist. Spreading the joists out to 4' oc will drastically reduce the density of these connections & leave you a pretty small shear capacity.  With lots of perimeter shear wall its shouldn't be a problem but YMMV.
Chuck Utzman, P.E.

Lloyd Pack wrote:
On 23 Jun 2006 at 16:59, Brian wrote:


I am unfamiliar with this type of wood framing and was
wondering if anyone had experience or could provide
some information/details on this type of framing.  My
client would like to use 4x timber beams at 4'-0"oc
and 2x oak planks as the flooring system to a
residence.  This home is located in Florida.

I'm not quite sure how the system would go together. 
I believe that the flooring system wouldn't actually
be 2x planks similar to a patio deck.  I'm guessing is
that the floor sheathing would actually be multiple
layers (maybe 3?) of 1/2" plywood that would be
attached together to make a tongue and groove
connection.  I'm really not sure what type of nailing
would be required to connect the floor sheathing to
the 2x timber members.  I'm also assuming the timber
beam members would be supported on ganged 2x stud
posts or timber posts within the bearing wall.  

As you can tell, I'm pretty clueless on how this
system works.  I would appreciate any help that anyone
could give me.  Or, if someone could direct me to
where I may be able to find some more information or
typical details.

Thank you,
In addition to Scott's and Daryl's excellent replies, I would
add that a military document, UFC-???, has numbers on
the capacities for diaphragms made with roof and floor
systems framed this way.  There is a higher diaphragm shear 
capacity for placing the decking on a 45 degree slant instead  
of perpindicular to the floor joists.  I apologize for not having
the exact UFC number handy.  

Perhaps Buddy Showalter can lend some information from 
his organization on the use of this type of floor system as a 
shear diaphragm.

Take Care,
Lloyd Pack

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