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Re: Repair of Aluminum Trusses

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Gary,

At the AISC convention a few years ago there was an excellent presentation on heat straightening of damaged steel bridges. The before and after shots were really amazing. I can't lay my hands on the name of the speaker at the moment, but maybe Charlie Carter is monitoring or you could go to the AISC web site and ask.

I know steel and aluminum are not the same, but it was really like an art form to see what they were doing with steel. The man did have a consulting business and performed work all over the country.

Paul
----- Original Message ----- From: "Gary Hodgson & Associates" <ghodgson(--nospam--at)bellnet.ca>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, March 17, 2005 8:05 AM
Subject: Repair of Aluminum Trusses


List,

A few days ago I went to view a pipe bridge which spanned over a
road.  It was a box truss fabricated from aluminum.  A dump truck
driver tried to drive under it with the box still up.  As a result of
the collision, several members have been bent or broken.  The chord
members have been bent as much as 15" out of alignment over a length
of 20'-0".  The diagonals have been bent or broken.

Although I have designed aluminum members before, I have never dealt
with a repair job.  Is it advisable to replace the bent members by
welding in new members or by trying to straighten them?  My gut
instinct is to weld in new members but I would appreciate comments
from list members who have more experience with aluminum design and
fabrication.  Photos available on request.

Thanks,
Gary


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