Elevated platforms and classification as a 'Catwalk'

[PeteS42]

Has anyone ever encountered a definition for what constitutes a 'catwalk?'

Despite extensive searching of the IBC and OSHA, I have never found a definition for a 'catwalk' or clarification of what may be considered a catwalk. That said, I have only ever encountered the term 'catwalk' in IBC sections addressing Technical Production Areas (i.e. performance theaters). Are 'catwalks' exclusive to theaters and cannot be used within other occupancies? I ask from the context of determining design requirements (i.e. loading, guarding, and width) of elevated walking-working surfaces (platforms) which would be considered unoccupiable (i.e. for equipment access and maintenance).

 

[phamENG]

ASCE 7-10 provides design load requirements for "Catwalks for maintenance access" - which sounds to be precisely what you're looking for. As for guarding, OSHA requires General Industry to provide guardrails or fall protection for workers above 48". I don't think the building code provides a definition, but the dictionary says: "2.a narrow walkway or open bridge, especially in an industrial installation." Keep in mind that the 40psf in ASCE 7 should only be used for personnel access. If it will be used to move equipment, 60psf would be a minimum and possibly more depending on the conditions and type of equipment/material that will be on it.

 

[Ron247]

To me, a catwalk is an access platform/walkway for maintenance or "effects" assistance during a show. It is not a walkway for general public usage.