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hollow core slab for warehouse mezzanine

hollow core slab for warehouse mezzanine

hollow core slab for warehouse mezzanine

i'm trying to determine load capacity for a mezzanine floor in a warehouse.  The concrete slab is cored and has a 24' clear span; but there are no details showing the reinforcement of the slab, whether it has ordinary steel reinforcement or strands, or the size of the cores.  What would be the best way of trying to determine the capacity of the floor?  What non-destructive method could I use to find the amount/type of reinforcement in the slab? I'm fairly new to this and not very knowledgeable of the technology associated with this type of analysis.

RE: hollow core slab for warehouse mezzanine

I'd call your local prestressed concrete supplier that deals with hollow core and ask them if they have any records of the project.  There's a limited number of manufacturers for hollow core and they tend not to ship it very far.
If that doesn't work, I'd measure the depth and go to the PCI design handbook and pick a conservative capacity for the span/depth from their tables.
Even if you could find all the reinforcing, you'd just have to make a lot of additional assumptions to calculate anything meaningful.

RE: hollow core slab for warehouse mezzanine

When was it constructed?
I would check out the PCI Design Handbook and make some conservative assumptions.  You really need to get a good idea of the cross-section, since this will play a large role in the serviceability considerations.  You will also need to assume an initial jacking stress (typically 0.7fpu for cast plank and 0.65fpu for extruded plank).  There are a lot of variables involved and unless you have a good deal of information and are comfortable doing the calculations you should really contact a local supplier and see if they can help you out.  
You should also get on the owners of the warehouse to try to dig up some existing shop drawings for you.

RE: hollow core slab for warehouse mezzanine

The warehouse was built in 1976-77. I talked with the owner and he didn't have any shop drawings.  I'll get in touch with the contractor and architect to see if they have any information. I sure appreciate both of your responses.

RE: hollow core slab for warehouse mezzanine

No records on microfische with the local building jurisdiction? (I go back a ways)...

If you have an 8" slab, you're probably looking at either an office loading (50 + 20), or 125 psf light storage.  

If you have a 12" slab, then mostlikely 250 psf heavy storage, or even heavier.

Hopefully you do not have a 6" slab...

Mike McCann
MMC Engineering

RE: hollow core slab for warehouse mezzanine

Add a concentrated load at midspan and measure the deflection.  Thus EI can be calculated.

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