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Re: seaint Digest for 9 Dec 2011

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Is there some reason that you cannot use pipe shores resting on cribbing? Building a temporary steel frame seems pretty heroic, unless the bottom chord is really high off the ground.

Another thought: is it possible to add steel tension rods or cable on each side of the truss and "suck up" the middle of the span in the manner? (Anchor the tension members so that when you load them the truss deflects upwards.)

I have a friend who used this system on trusses in a warehouse in Sacrtamento. This eliminates the need for the shoring, since tehe work is all done on the exterior of the two sides of the truss. / eric

On 12/10/2011 12:00 AM, admin wrote:
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                        seaint Digest for 9 Dec 2011

Topics covered in this issue include:

    1: Jacking System Detailing
              by "Felker, Brian P CIV NAVFAC MIDLANT, IPTNE"<brian.felker(--nospam--at)navy.mil>



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1                                Message:0001                            1
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Subject: Jacking System Detailing
From: "Felker, Brian P CIV NAVFAC MIDLANT, IPTNE"<brian.felker(--nospam--at)navy.mil>
To:<seaint(--nospam--at)seaint.org>

This is a multi-part message in MIME format.

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I am designing a shoring and jacking system for a damaged heavy timber truss.  The truss is a WWII vintage multi-ply truss with split ring connections, etc.  As is often the case with such trusses, the subject is suffering from a tension chord rupture.  One of the two bottom chord plies has completely ruptured, and hence the remaining bottom chord ply and its split ring connections have assumed the full tension load.

In order to repair the damage, the first step is to support and minimally raise the truss to relieve the presently overstressed members and connections.  My intent is to design a structural steel frame to pick up the truss at the structurally appropriate locations, and use bottle jacks supported from shoring platforms to gently raise the frame.  I am comfortable with the design of the shoring platforms; however, I would like to know of any references that might be helpful in detailing the support assembly consisting of the bottle jacks and steel frame.  My primary concern is stability at the bearings of the steel frame on the jacks.

Thanks in advance for your assistance,

Brian Felker, P.E.
Design Manager/Structural Engineer
NAVFAC MIDLANT / IPT NE
9742 Maryland Ave, Bldg Z-140
Norfolk, VA 23511-3095
(p) 757.341.2047
(f) 757.341.2095
brian.felker(--nospam--at)navy.mil



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