Decking with Heavy Loads

[JimmyD123]

Any suggestions on a metal decking that can span 5ft with 700psf load?
Thanks

 

[JAE]

Roof deck?
Floor deck with concrete topping?

If no concrete is the load distributed with some type of surface or sheathing?

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[bearjew]

...Metal decking alone or with concrete topping? Composite action or non composite?

 

[JimmyD123]

I am open to composite or non-composite decking. this is a construction slab/decking that will support a thick concrete slab while it cures.

 

[MotorCity]

Composite deck won't be of any use since it is intend to support wet concrete. I doubt that you will get traditional deck depth and thicknesses to work, but you may get deep cellular deck to work. How about designing a solid steel plate, precast plank, or removable wood formwork? Can it be shored from below?

 

[bearjew]

Assuming a 3-span condition, I think you can accomplish 700psf + DL with 8" slab over 3" NC decking. WWF likely wont suffice though. You'll probably need (2) layers of #4 bars @ 12".

And you'll have some very heavy steel below depending on the spans, but thats where I'd start anyways.

 

[JimmyD123]

There is no way to shore it from below. it is 127' up with nothing underneath. This is the slab of a water pedestal We are pouring a 4'-6" thick slab up there to support a large water tank. we have beams underneath the slab. So basically this decking will only support that slab until it cures. I think i am going with formdeck with rebar

 

[JAE]

You could use a deck with limited height concrete slab (at a thickness the deck could support) and then come back later and add additional concrete to the 4'-6" thickness you need.
You might have to tie the two layers of slab together with vertical ties of some sort if you need the two layers to work as one.



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[OldBldgGuy]

JAE has the answer for me.