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CFS Column with Fixed Base

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Catching up on my reading after vacation.  Responding
to a message from late June:  Bill, if you're still
trying to do this, you might consider a plate about 3
inches (or more) bigger all around than your column
section.  Make the plate maybe 3/16 or 1/4 inch thick.
 Cut tabs on the bottom of your cold-formed box
column, with corresponding slots magically
(expensively) cut in your plate.  Insert the tabs
through the slots, bend them out flat, put the plate
on another plate (trapping the tabs), and drive powder
actuated pins or screws through both.  This will give
you pretty reliable fixity.

Next, put on your plans, "Contractor may substitute
TS4x4 with 3/4x10x10 baseplate."  They will.

For further clarification, see George's comments

To me CFS is similar to wood and brick masonry in that
the connections primarily serve to hold the members in
a position of strength (i.e. direct bearing), or at
most are used in simple shear.  This as opposed to
structural steel or concrete, in which we can design
connections or joints that are basically as strong and
ductile as the main members.

Actually, if you really want to make your fixed-base
column, just embed the base in about a foot of
concrete.  That, you could actually get built.

Mike Hemstad, P.E.
St. Paul, Minnesota    

Original Message:
31                               Message:0031         
From: "George Richards, P.E." 
To: "'seaint(--nospam--at)'" 
Subject: RE: CFS Column with Fixed Base?

Don't try.  

George Richards, P. E.

-----Original Message-----
From: Bill Polhemus [mailto:bill(--nospam--at)]
Sent: Monday, June 25, 2001 5:41 PM
To: SEAINT; Aec-Residential@Polhemus. Cc
Subject: Q: CFS Column with Fixed Base?

Okay, before you snort, guffaw, or otherwise evidence
your disbelief that
one could pose a question so preposterous, remember
that I'm (with deep
fascination, I assure you) endeavoring to get up to
speed on CFS design, and
so the preposterous must invariably come up from time
to time.

I want to make a "box section" column that will able
to resist moments at
the base. I'm not sure if this is feasible, unless
some sort of bizarre shop
fabrication were involved--which I want to get away
from if at all possible.

Anyone have any ideas?

William L. Polhemus, Jr., P.E.
Polhemus Engineering Company
Katy, Texas
Phone 281-492-2251
Fax 281-492-8203

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