Staircase Loading

[Samwise Gamgee]

Other than the live load of 100psf as specified in code , how much additional dead / super imposed dead load do staircases need to be designed for ?

Dead Load = ??
Super Imposed Dead Load = ??

 

[phamENG]

The weight of permanent construction materials. That's about it for any dead load so far as I'm aware.

 

[KootK]

I normally don't design stair cases for any superimposed dead. Just the weight of the assembly as initially constructed.

 

[Samwise Gamgee]

Do I need to consult the manufacturer for the permanent weight of the assembly ?

 

[KootK]

That's one way to go about it. Another, more common way if you have enough information is to simply calculate the weight of the assembly based on its constituent parts.

 

[MIStructE_IRE]

Depends entirely on the situation. I had a stairs recently where the architect wanted to clad the entire thing (tread, riser and soffit) with 40mm stone. So find out what you’re dealing with first.

 

[dik]

Live load and total dead load. If you are putting pavers/tiles on it, include these loads. If carpet, you might want to add 1 psf for the carpet.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Samwise Gamgee]

I got a value of 50psf for metal staircase which is not concrete filled. Even with 1.5" concrete , it goes up to 75psf.

Total Dead Load = 75psf
Total Live Load = 100 psf

Isn't that a bit too much ?

 

[phamENG]

If that's what it weighs, then no it isn't.

 

[JLNJ]

50 psf does seem like a lot for just the stringers, rails, and a metal pan. I would expect less than half that much. Check your logic and your math.

 

[MIStructE_IRE]

One of my favourite engineering sayings is very much applicable here - it is what it is.

 

[dik]

If that's what you have, run with it. It sounds a tad high for 1-1/2" topping treads and 2-1/2" on 1-1/2" deck.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dik]

Check the attached...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[AD_design]

Usually Dead load need to be calculate based on concrete thickness on pan and other components. Mostly it will come nearby 50 psf and for Terrazzo or 4" thick concrete filled pans it will go up and can be consider 60 - 65 psf for staircases. You can refer NAAMM Manual 5th edition and AISC Design guide 34 for more details on staircase design.

 

[XR250]

50 PSF seems excessive.
Can you post your calcs?

 

[TLHS]

But also ask whether it really matters if your number is too conservative. I've often found that the stringers are governed by constructability concerns. If the stringers you'd use anyway work with a conservative dead load, then there's no reason to poke into it more to get more accurate