Transverse Cracking of Deck Slabs
Transverse Cracking of Deck Slabs
(OP)
Over the past few years, many newly constructed bridges in the Northeast have had issues with transverse cracks developing on the underside of the deck slabs relatively shortly (< 1 year) after construction. Oftentimes the cracks are apparent in all interior bays (full length of bridge, + and - moment areas) and spaced anywhere from 3' to 8' on center. I'm aware of at least one study sponsored by a handful of New England transportation authorities that looked into this problem. As a result, there has been a good deal of debate relating to the cause of this problem. The cracking has been blamed on everying from superplasticizer in the concrete to composite action between the steel stringers and the concrete deck.
I'm inerested to find out exactly how widespread this problem is. Have any of you encountered this in your bridge projects? Have you discovered any means for reducing the frequency and magnitude of the cracking?
I'm inerested to find out exactly how widespread this problem is. Have any of you encountered this in your bridge projects? Have you discovered any means for reducing the frequency and magnitude of the cracking?





RE: Transverse Cracking of Deck Slabs
RE: Transverse Cracking of Deck Slabs
http://www.ltrc.lsu.edu/TRB_82/TRB2003-001122.pdf
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RE: Transverse Cracking of Deck Slabs
I've always thought it was related to flexibility. The steel beams deflect elastically, beyond the concrete deck's tensile capacity. Since the bottom face has too much tension, it cracks transversely near midspan. The situation should be reversed near the supports (cracking on top).
Most every bridge project I've worked on used p/s concrete beams, so I have no design advice for the problem. One potential retrofit is to apply carbon reinforced fibre sheets to either the beam flanges or the deck underside to reduce flexure.
Regards, RAF
RE: Transverse Cracking of Deck Slabs
Regards
VOD