OSHA Aluminum Industrial Stair

[ELI07]

I'm designing a stair, considering aluminum as of now. Need to be per OSHA requirements, have read Link the requirements but still confused about how to apply the loads.
I've always used 100 psf per IBC 1607.1 but OSHA 1910.24 says "five times the normal live load anticipated but never of less strength than to carry safely a moving concentrated load of 1000 pounds" .... do I need to consider 5x100= 500 psf uniform load on the treads/platform area? and then carry this reaction to my channel/support?
and on my second moment diagram using 1000 lb moving load, i don't understand if I should apply it at the edge of each tread/platform which will become 1000lb per linear foot along my channel or just once at the midspan of the channel (I have 6 steps of 8" rise and 11" run and a platform of 9.5 ft)
Do I also have to add the 200 lb from the guardrails to the diagram that gives me the max moment from above, assuming that my worst case is a moment at the connection to the channel from 200 lb applied horizontally at top rail...
I apologize in advance about my inexperience... I'm not familiar at all with OSHA requirements.... I hope somebody it out there to help. Thanks

 

[msquared48]

You have the spec for "Fixed industrial stairs" which is far more restrictive than residential.

Is industrial what you need?

Mike McCann
MMC Engineering

 

[ELI07]

yes, it is industrial... they told me to use 1910.24 requirements and for handrails 1910.23 per OSHA

 

[Jerehmy]

I don't apply a vertical railing load concurrently with the load on the stairway because it doesn't make sense. If a person is pushing down on the railing with 50 plf or 200lb point load, there's that much less load on the grating.

I do apply a horizontal load of 50plf concurrently and check the channel for torsion per AISC design guide 9 though.