Reinforcing in Flute of Concrete over Steel Deck -
Reinforcing in Flute of Concrete over Steel Deck -
(OP)
Looking at combining the composite slab reinforcing (3@18" 1" clr. from top of slab) with Flute Valley reinforcing (#5@12" in flute, 1" clr. from bottom) into a Larger Diameter Welded Wire Reinforcing. Been looking for reasons why the EOR has bar in the flute, can anyone help guide me as to the purpose of the bars in the flute, and why they can't be brought up into the slab. 7.5" slab total thickness w/ 3" decking and 4.5" slab.
Thank you in advance!
Thank you in advance!






RE: Reinforcing in Flute of Concrete over Steel Deck -
1) the composite deck alone is not enough or;
2) the slab is in a corrosive environment and cannot be relied upon for strength or;
3) Some aspect of fire protection prevents the composite deck from being considered reliable.
Moving the reinforcing significantly upwards will significantly decrease its contribution to flexural capacity.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Reinforcing in Flute of Concrete over Steel Deck -
Another reason that I would mention is that a lot of us old timers don't trust composite deck and always add reinforcing. And as the EOR, that's our design decision.
RE: Reinforcing in Flute of Concrete over Steel Deck -
Nowhere was it indicated no-one asked, which is exactly why the Eng-Tips community was approached.... simply doing my homework is all.
This is what seems to be going on; the EoR is using the composite decking merely as a form system (forklift loading is in play). So we are in T-beam design??? Been sorting through a pdf on T-beam design, trying to determine how substantial the As increase will be if I pull the reinforcing in the flute up. My hunch is this is not going to fly, but the labor impact of running a bar down a flute vs. moving the steel up into the flange area is substantial. There's hundreds of thousands of square feet.
Been reading through this...but its a little above my pay grade...[https://www.slideshare.net/elixireros/t-beam-ultim...[/link]
RE: Reinforcing in Flute of Concrete over Steel Deck -
If forklift traffic is anticipated, the EOR may have had concerns over the long term bond between deck and concrete - necessary for flexural strength.
By adding the bars, set in the deck valleys you create a very positive deck system, flexurally.
No T beam behavior here - the bottom bars in tension and the top band of slab in compression - no different than a typically reinforced concrete slab.
The deck flutes would all be in the tension zone of the cross section and thus ignored and assumed fully cracked at ultimate strength.
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RE: Reinforcing in Flute of Concrete over Steel Deck -
RE: Reinforcing in Flute of Concrete over Steel Deck -
Check out Eng-Tips Forum's Policies here:
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RE: Reinforcing in Flute of Concrete over Steel Deck -
RE: Reinforcing in Flute of Concrete over Steel Deck -
RE: Reinforcing in Flute of Concrete over Steel Deck -
RE: Reinforcing in Flute of Concrete over Steel Deck -
I'd normally do it somewhere we're I'm not convinced that the deck is going to be protected in the long term. For instance, most industrial installations I'll ignore the contribution of the deck, because they're normally not hidden away and aren't protected from corrosion. I've seen a whole lot of corroded industrial decking over the years. I might do the same in some outdoor applications.
You may also do it if there are constraints on slab thickness but extra bending strength is required.
RE: Reinforcing in Flute of Concrete over Steel Deck -
RE: Reinforcing in Flute of Concrete over Steel Deck -
Can anyone direct me to a calc example that determines reinforcing As?
RE: Reinforcing in Flute of Concrete over Steel Deck -
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RE: Reinforcing in Flute of Concrete over Steel Deck -