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RE: Fixed base timber column

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Hi Tom:

How about cast 4-ft or so timber column into the caisson?
The timber to be treated and concrete surface slopes away from the column to
prevent water retention near the wood. Rebar cage would be used around the
wood column in concrete to transfer moment into the caisson. Good luck!


> -----Original Message-----
> From: Thomas Long [mailto:tomlong(--nospam--at)]
> Sent: Wednesday, January 20, 1999 10:00 AM
> Subject: Fixed base timber column
> Importance: High
> I am designing a free standing trellis.  The footprint is about 100ft x
> 20ft.  The owner wants to use 10x10 timber columns, 10x12 beams with 4x8
> lattice at 36" o/c.  The columns are founded on 18" diameter
> caissons.  The
> timber columns are spaced at 14'-0".
> The owner would not like to see the typical knee braces to support the
> timber frame from lateral movement, and no exposed connections.
> I have been
> tossing ideas around in my head about how to approach this fixed
> base timber
> column condition.
> The ideas I have come up with are:
> 1. Use a vertical steel plate in the center of the column and bolt through
> and plug the holes.  I do not feel to good about this.
> 2. Embed threaded rods into the concrete either when they pour
> the caissons
> or then drill into the column and install with epoxy adhesive.  Not a bad
> solution, but how do I design it.
> 3. Embed a 2" +- pipe column into the concrete and drill the
> column and then
> bolt through and plug.  Hard to drill into the timber and to construct.
> Has any body designed a structure like this and if there is, how
> did you do
> it, what is the best solution.
> Thank you in advance.
> Thomas Long
> Thomas Long Engineering