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Re: base plate software

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In addition, above 1 1/2" will require pre and post heat operations which
can cost more than a couple stiffeners.  Also above 2" can lead to lamellar
problems which requires testing and certification of the plate material.

I would discuss plate thickness with some of the local fabricators before
exceeding 1 1/2" on smaller projects, you might find stiffeners are
preferred.

Paul Feather

----- Original Message -----
From: Paul Ransom <ad026(--nospam--at)hwcn.org>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, June 14, 2000 6:22 PM
Subject: Re: base plate software


> > From: Panos Trochalakis <panost(--nospam--at)ckcps.com>
>
> > Could either a steel fabricator or someone from AISC respond regarding
> > economical base plate thicknesses? At what point does it become more
> > economical to start using stiff. plates or other stiffening elements to
> > reduce the base plate thickness. An example is using stiff. plates or
small
> > channels at moment frame or braced frame columns with large uplift
loads.
> > There would be a savings in material. However, there is added shop
welding
> > of the stiffening elements.
>
> It takes a lot of steel to balance the labour cost for even small
> amounts of welding and material handling to make stiffeners.
>
> However, above about 1 1/2" thick base plates you will have difficulty
> getting holes punched. Then the cost of reaming holes probably matches
> labour for welding a couple simple stiffeners.
>
> After that, base plate thickness probably isn't a major factor in more
> complex base arrangements.
>
> --
> Paul Ransom, P. Eng.
> Civil/Structural/Project/International
> Burlington, Ontario, Canada
> <mailto:ad026(--nospam--at)hwcn.org> <http://www.hwcn.org/~ad026/civil.html>
>
>