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RE: Steel Stairs and Railing Design[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Steel Stairs and Railing Design
- From: "Gary Loomis" <gloomis(--nospam--at)MasterEngineersinc.com>
- Date: Mon, 7 Apr 2008 06:08:31 -0400
The NAAMM is an excellent reference and provides plenty of useful tables, typical details, specifications, etc. The design loads are provided in IBC and ASCE 7 for stairs and handrails. For stairs the live loads are 100 psf and I think a 300 lbs. concentrated load. I do not have the codes at home. For handrails, a concentrated load of 200 lbs in any direction or 50 plf, not to be considered concurrently. At one time the IBC allowed an 1/3 increase in allowable stresses for handrail. Not sure if it still does. You should check the specifications from the architect/engineer. Sometimes they will define the loads and also a maximum deflection which on long spans may govern. Typically the specify a maximum deflection of a stringer of 1/4". OSHA also has requirements which vary from the building code. The loads are larger but it is not clear if they are talking about using allowable stresses or yield. We design per the building code. There are also minimum widths, height of rails, infill, etc. This is all covered by the IBC or BOCA or UBC. Not sure which code is used in your area. Gary Loomis, PE Master Engineers and Designers Inc. I have a client who is a steel fabricator employed by the contractor on a project. Per the specs, he is required to provide design calculations for the stair design as well as the railing design. Are there any good reference materials that address the design of metal stairs and handrails? I did a quick search and discovered that the NAAMM metal stairs manual is not available online, although I am not sure that would even be useful.
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