This may be an old question that everyone has asked before, would really appreciate the help.
Looking thru the hollow core planks catalog for my project, I noticed that the planks may have 1" camber in it.
1. What does this really mean for the topping slab? Should I increase the topping slab...
Ron: I would really like to go that way.
Brad805: What kind of gypcrete thickness you've used in the 4-stories? 3/4" or 1" or 2"?
Thank you all for input. It would have been an easy decision if the code were to forbid the method.
Calculated a maximum ultimate diaphragm shear of 0.8 k/ft...
Kootk: Agreed, you have a good point about the labor to pour topping versus gypcrete. Very insightful discussion and greatly appreciate the opinion. I guess I need to contact the contractor for some pricing exercise.
Well, if we go with 0.75" gypcrete, we save about 18psf per floor, and for 5 stories it's 90 psf, and that's significant.
0.75" Gypcrete = 7 psf
8" bare plank = 54 psf (from Old Castle catalog)
8" plank + 2"topping = 79 psf (from Old Castle catalog)
For buildings in SDC A-C, either method is...
Ron: I appreciate your concern, and I am myself as well. Just want to clarify: you mentioned "I have not seen a multi-story hollow core/masonry project in Florida without a topping slab..." this 'topping slab' that you referenced, do you mean by structural topping slab for diaphragm or just...
Agree, I am all for topping slab, no doubt it's the best practice for a reliable diaphragm, I was just wondering if untopped hollow core plank has been used for multi story structure.
I have also found a project done locally where light weight 2" non structural topping is used.
Ron and KootK,
thank you for the valuable input, greatly appreciate it.
Another alternate to a diaphragm topping slab is physical plank to plank connection with shear ties or embed plates. Totally agree on the chord strength and continuity. Found a good article abstract from FEMA P751 showing...
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Thanks for all the replies.
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