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Re: Heat-straightening of Structural Steel

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John,

AASHTO Division II section 11.4.7 addresses straightening of steel.  You
might check with a fabricator, they do it all the time.

If you have to cut and paste you may need to replace most of the length of
the flange or you may have problems with fatigue.

We had a similar situation in Iowa City about 10 years ago on a bridge over
U.S. Hwy 6.  We doubled up a 36 inch beam on a 70 foot span at a cost of
only $20k.  The existing beam was left in place.  Some dead load was put on
the new beam by pulling up on it through holes in the deck with a crane (be
careful you don't break the slab).

John, I could send you a copy of the plans.

Steve Jacobsen, P.E.
NNW, Inc.
Iowa City, Iowa


----- Original Message -----
From: John Riley <jpriley485(--nospam--at)peoplepc.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Saturday, March 18, 2000 7:15 AM
Subject: Heat-straightening of Structural Steel


> An insurance company has hired me to investigate repair to an
impact-damaged
> bridge; concrete deck on four steel plate girders (48"?).  Bottom flanges
of
> two girders were displaced laterally, maybe 3 inches, and locally buckled.
> The girder top flange and the concrete deck appear unaffected.
>
> My thought is that the girders could be (a) realigned using a combination
of
> force (applied to bottom flange) and heat (applied to flange and web) and
> (b) "cut and paste" at the localized buckling.  Of course the owner wants
a
> new bridge.
>
> So, I'd like to find relevant information on this type of repair.
>
> Thank you,
>
> John P. Riley, SE
> Riley Engineering
> Blue Grass, Iowa
>
>