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RE: Pre-Engineered Metal Building Foundation - Ballpark Design

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Bill,

What we do is specify what kind of frame goes with our column line
layout.  We label the type of framing we want: rigid frame (RF, say),
end frame, portal frame over roll-up doors, etc.  We usually layout
columns at 20' or so.  Then we calc our own reactions (pinned supports).
We create a pedestal large enough to cover most baseplates, put a lot of
notes like "coordinate anchor bolts with manufacturer requirements".
The manufacturer designs the building frame sizes based on our layout.
Then we coordinate our requirements with the way they do things and
tweak it.  We put our design loads on the contract drawings and make
sure our foundations cover their loads on the shop drawings.  It never
matches exactly.  Uplift is mostly what controls for us.  Just make sure
they are big enough before the shovels break ground.

Glenn C. Otto, P.E.
LIBERTY ENGINEERING, P.C.
Virginia Beach, VA

-----Original Message-----
From: Bill Polhemus [mailto:bill(--nospam--at)polhemus.cc] 
Sent: Tuesday, July 09, 2002 1:14 PM
To: seaint(--nospam--at)seaint.org
Subject: Pre-Engineered Metal Building Foundation - Ballpark Design

Greetings.

I'm running into these kinds of jobs from time to time where a developer
or
owner wants to proceed with a building which is all or part a metal
building, and needs as much engineering done as possible to get the
building
permit, expedite the schedule, and sometimes even for financing.

So, we have an architect's plan, and it has been sent to the metal
building
vendor(s) for a quote. We have a geotechnical report. And it's enough
for me
to get about 80% done with the foundation, but what I'm finding is the
metal
building guy doesn't want to bother with any sort of preliminary design,
understandably, because he doesn't even know if he's getting the
contract.
So of course I have no reactions, no base plate dimensions, etc.

I have to explain to the contractor/owner/developer/whatever that I can
get
"almost there" but not all the way, and they are puzzled because, of
course,
they think all this stuff is just cook-book and only needed because they
can't get a permit without a sealed drawing. Most of the time they're
patient (with the subtext "man, these engineers are a hard bunch to deal
with"), although a few times they've been downright hostile ("I've never
had
this problem before. Are you SURE you know what you're doing?")

Anyway, I wonder if anyone else sees this from time to time, and how you
deal with it?



William L. Polhemus, Jr. P.E.
Polhemus Engineering Company
Katy, TX, USA
Phone (281) 492-2251
FAX (281) 492-8203
email bill(--nospam--at)polhemus.cc



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