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RE: Flat Slab Bridge
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Flat Slab Bridge
- From: "Frieberg, Lee" <Frieberg(--nospam--at)pbworld.com>
- Date: Thu, 27 Feb 2003 13:00:56 -0500
you considered using a version of a vertical restrainer. THese are
commonly used in seismic areas and would allow an expansion movement. You
might have to thicken the abutment ends of your flat slab. Properly
designed you could then count on the dead load of your
I've got a project with several C.I.P. flat slab
bridges with spans lengths of 13' / 30' / 13'. With such short end spans, there is uplift at each end of the bridge if
a continuous deck is used. There is too much uplift to simply thicken
the deck at the ends.
Rather than use simple spans to eliminate the
uplift, I'm considering using integral abutments to resist the uplift. I
know integral abutments have been used sucessfully on steel bridges, but I've
not heard of them being used on flat slab bridges. A further
complication is that the agency requires 24" sq. conc. piles. Obviously,
they will be much stiffer than the H-piles normally used in integral
abutments. I don't need a lot of movement in order to accomodate thermal
expansion/contraction, but I do need some.
Any comments, ideas, suggestions?
M. David Finley, P.E.
2086 SW Main Boulevard -
Lake City, FL