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RE: Concrete Cover Over WF Beam[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Concrete Cover Over WF Beam
- From: "Adair, Joel" <jadair(--nospam--at)shwgroup.com>
- Date: Fri, 21 Aug 2009 17:34:07 -0500
- Priority: normal
Either way, it seems pretty problematic. If you leave the thin concrete cover, it’s going to crack up, as several others have pointed out. Putting an exposed steel cover plate would create problems, as well – what happens when your beam isn’t perfectly flat (or, at least, not flat enough for floor tolerances)? Suppose it has a little excessive natural camber? It seems like control of the floor flatness will be a challenge.
Can you consider other alternatives? The girder-slab system that Matthew Stuart suggested could be a possibility. Or maybe just a thicker topping slab?
Sorry, not a lot of help – just a few thoughts.
Joel Adair, PE, LEED® AP
It is going to be sealed
concrete, no other finish.
On Fri, Aug 21, 2009 at 11:11 AM, David Topete <d.topete73(--nospam--at)gmail.com> wrote:
Expect the 3/8" concrete to spall/crack/crumble. No way around that. What's gonna be the finish flooring material? I'd say leave that strip bare during the placement of the topping, and come back with a non-shrink grout to fill above the WF. But, others may have a better/simpler idea...
On Fri, Aug 21, 2009 at 6:49 AM, Bill Polhemus <bill(--nospam--at)polhemus.cc> wrote:
William Haynes wrote:
I have a case that is very similar to the following detail.
I am only going to have 3/8" of concrete cover over the top of the WF
Remember that "cover" is specifically for
protection of steel reinforcement against the elements. Unless you are going to
add shear transfer studs (e.g.) to the top of the beam, you cannot expect a
predictable amount of "bond" between the concrete and the steel so it
doesn't matter if you "prepare" the surface or not. I'm not aware of
anything other than studs, angles, etc., welded to the top flange of the beam
that would provide a predictable shear transfer.
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