Composite metal deck~point load

[dgkhan]

I have a 4" composite metal deck floor. Steel deck is obviously ribbed and thickness is 0.036 inch. For 4 feet span factored load is 637 PSF. The wheel of scissor lift exerts 110 psi for 4" x 1.5" area. Now
110 psi = 16000 psf per 4 feet = 4000 psf. So deck is not ok. Now contractor will scream If I Ask him to reshore.Am I doing any thing wrong in calcs

 

[ssweetland]

Your approach is a bit to conservative, the load will be distributed out over a larger area based on floor deck section and reinforcing in the concrete section.

You should refer to the "Composite Deck Design Handbook" by SDI. It has examples of how to calculate deck capacity for concentrated loads, I think that it even has an example of wheel loads.

 

[slickdeals]

Refer to this example for a forklift loading

http://www.njb-united.com/usd/examples/example3.pdf

 

[Lion06]

dgkhan-

The number you came up with is more relevant to concrete bearing, not the capacity of the deck. Check out this paper that gives some guidance of how to distribute a point load on a slab.

 

[csd72]

The njb reference is the best one, another link giving the theory is:

http://www.njb-united.com/usd/ddds/data33.pdf

 

[dgkhan]

StructuralEIT,

I was so glad to see that you posted this paper. Can you please give me any reference, fro where this paper originated, author etc.
many thanks...