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RE: Butt-Plated Column Splices

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The detail shown is a generic detail that can be used in the majority of 
cases. It is intended, though, that the detail be checked for the actual 
force transfer requirements. The sizes given are good ball-park 
thicknesses. If you have significant differences between the column depths, 
there is the potential for bending in the butt plate, which would probably 
have to be addressed with a yield-line or other suitable approach. But 
there is a mitigating factor on the bending part...if you have one of the 
columns much smaller than the other, this usually means that the load is 
also much smaller.

For a butt-plate splice of a column of very similar or the same 
cross-section, the plate thickness doesn't matter much. But for that 
application, a butt plate may not make much sense anyway...although there 
wouldn't be anything wrong with using it if you wanted to. I'd select the 
thickness in that case to be consistent with other plates used on the job 
for convenience and cost effectiveness.

Charlie

-----Original Message-----
From:	RainCat1(--nospam--at)aol.com [SMTP:RainCat1(--nospam--at)aol.com]
Sent:	Thursday, August 12, 1999 6:10 PM
To:	seaint(--nospam--at)seaint.org
Subject:	Butt-Plated Column Splices

LRFD Volume II page 11-69 gives typical butt plate thickness as 1 1/2" for 
W8
over W10, and 2" for others. Is there any method to calculate the required
thickness? What about same column splice (same cross sections above & 
below)
where no bending is introduce in the butt plate!?

Thanks!