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RE: Foundations for a 3-pinned arch stadium

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Why not make the footing large enough for the overturning moment?  How deep
is the footing going to be?  When you consider encasing the rods in concrete
is it any less concrete?  Can you go deeper and add fill on top for
additional weight?  Or use helical anchors to resist the uplift?  On
pre-engineered building foundations with large uplift forces we have used
helical anchors to resist the uplift.   

Just some thoughts.

Gary W. Loomis, P.E., Senior Structural Engineering
Master Engineers and Designers, Inc.
-----Original Message-----
From: Gary L. Hodgson and Assoc. [mailto:ghodgson(--nospam--at)bellnet.ca] 
Sent: Tuesday, October 09, 2007 7:46 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Foundations for a 3-pinned arch stadium

Kevin,
I did a pre-eng bldg almost as big as yours several years ago.  The 
contractor wanted tie rods to cut down the size of the footings, He said 
he would never do that again.  We had two 2" diam tie rods that had to 
be embedded in a separate conc trench.  As the distance was something 
like 160', we had to use turnbuckles to tighten the rods and welded some 
of the pieces together.  He said the cost of more concrete would have 
been cheaper and faster.
Gary

Kevin Below wrote:
>
> What about a tie-rod (it would need to be big) under the sports 
> surface, tying the 2 sides together ?
>
> Kevin
>
> kbofoz
>

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