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RE: Flat Slab Bridge

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David,
 
If your stuck with that span arrangement:
1.  Don't worry about the integral abutment...there isn't enough expansion length to worry about. 
2.  Make sure your abutment & approach slab has sufficient dead load to counterbalance 150% of the uplift.
3.  Provide a positive connection to the piles.  Don't just cast the concrete over the top.
 
Duane Siegfried, P.E., S.E.
-----Original Message-----
From: M. David Finley, P.E. [mailto:pec(--nospam--at)isgroup.net]
Sent: Tuesday, February 25, 2003 8:38 AM
To: seaint(--nospam--at)seaint.org
Subject: Flat Slab Bridge

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 - Suite 111
Lake City, FL  32025
386-752-6400