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Cantilever Steel Stairs

Cantilever Steel Stairs

Cantilever Steel Stairs

(OP)
Can anyone please direct me to a design guide for cantilever stairs in steel? I'm looking at one at the moment and any help on this topic will be appreciated.

RE: Cantilever Steel Stairs

Please define what you mean by "cantilever". Stringers, treads, landings, etc.

RE: Cantilever Steel Stairs

(OP)
apologies for not being specific.

The stair has no support at mid landing and are only supported at structural floor level i.e stringers are cantilevered off the floors!

RE: Cantilever Steel Stairs

Where are you located?  I think this is more of a "scissor stair" than a cantilevered stair.  I would be concerned about vibrations for this case.  The strength design should be pretty straightforward, especially if you can model it in Advanse or Risa.

RE: Cantilever Steel Stairs

These stairs rely both on fixity at the floor levels and truss action between the stringers and torsion in the members connecting the stringers together.

A 3D model should be sufficient for you to determine stresses, rotations and deflections. In addition to 100% loading on both flights, I also recommend using full loading a one flight with zero on the other to look at maximum torsion.

RE: Cantilever Steel Stairs

jike is correct. Modeling the staircase as described is the way to do it. Detailing is the next key. If you are in a seismic region or a heavy wind region you will also need to add lateral loads to the model. I would recommend some members be added to the floor framing to drag loads from the stringers into the building diaphragm for gravity and lateral loads.

RE: Cantilever Steel Stairs

(OP)
Thanks everyone you for your valuable insight.

StructIET - yes you are right, it is a scissors stairs, I'm based in Eire. The stair is cantilevers off link bridges between two blocks and is a feature in the atrium space.
Done a similar design with a solid concrete stair and followed guidance in Reynold's Concrete Designer's Manual.

RE: Cantilever Steel Stairs

Quote (ZimStruct ):

Reynolds's Concrete Designer's Manual

That is such a brilliant book!  10th edition should be in every engineer's library

RE: Cantilever Steel Stairs

Why? You don't like the 11th edition?

RE: Cantilever Steel Stairs

I dont have the 11th edition but from what i hear they have cut a few things out of it and its not as involved at the 10th edition?...might just their personal view though!

RE: Cantilever Steel Stairs

I haven't seen the 10th so I can't judge, perhaps I should check it out.
Certainly the printing quality of the 11th edition is poor.

RE: Cantilever Steel Stairs

ZimStruct, just use the reynolds book to get your actions e.t.c. and do the rest of the the design to steel codes.

RE: Cantilever Steel Stairs

11th edition is not very good at all. I don't know what they were thinking when they printed it.

namely:

1. a lot of good charts are no longer in there (two way plate/cantilever wall charts)

2. a lot of the charts are hardly legible!! it's as though they photocopied the charts.

a poor update.

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