Existing bridge as form for slab bridge.
Existing bridge as form for slab bridge.
(OP)
Anyone have any information on using an existing deck of a bridge for building a structual slab deck. I think I can drill through an old deck and use H piles as the new substructure and then put a voided slab structure on top. This is the only thing I could find and I need something more detailed.
http://oak.arch.utas.edu.au/research/bridge/sem2.html
I plan on employing this concept on low traffic state bridges. Widening would be nice but I think we can get a design exception.
http://oak.arch.utas.edu.au/research/bridge/sem2.html
I plan on employing this concept on low traffic state bridges. Widening would be nice but I think we can get a design exception.





RE: Existing bridge as form for slab bridge.
Why not rip out the existing bridge, drive your piles build a cap and drop in some precast voided slabs (I assume were talking about a couple of short spans).
RE: Existing bridge as form for slab bridge.
RE: Existing bridge as form for slab bridge.
Prestressed, Precast deck beams with voids usually do have a wearing surface placed on top but it is not a requirement.
RE: Existing bridge as form for slab bridge.
Won't the finished result of your proposal be an engineering monstrosity from the aesthetic point of view? Is minimum cost the only criterion you need to meet?
RE: Existing bridge as form for slab bridge.
RE: Existing bridge as form for slab bridge.
Are you trying have the deck act compositely with the bridge as a strengthening measure? The cast-in-place deck will only help with live load. the existing bridge will support all dead load (including your additional deck) and its portion of the live load too. This will most likely lower the capacity of your bridge. You might want to consider some more traditional strengthening options (a good source is Xanthakos - Bridge Strengthening and Rehabilitation).
Is existing bridge deteriorated to the point where the slab span supposed to support the entire load with no help from the existing (deteriorated) structure? That's a bad idea. 80' is a long span for a C-I-P slab even without the extra dead load of the existing bridge when it deteriorates to the point where it can no longer support its own weight.