Open Web Steel Joist yr 1983 capacity
Open Web Steel Joist yr 1983 capacity
(OP)
Hey there,
I am working on a project that is to add an eco roof to an existing building, built in 1983. The roof is currently supported by open web steel joists type 20H6 @ 8'-0" O.C. spanning 33ft. Newer versions of the Steel Joist Institute design manual do not have this type of joist listed in them.
Does anyone have a copy of the older versions of the Steel Joist Institute design manual with this joist type? I would like to know the capacity of this joist. If you know how the naming convention of the joists were changed that would be helpful too.
Any help would be appreciated.
I am working on a project that is to add an eco roof to an existing building, built in 1983. The roof is currently supported by open web steel joists type 20H6 @ 8'-0" O.C. spanning 33ft. Newer versions of the Steel Joist Institute design manual do not have this type of joist listed in them.
Does anyone have a copy of the older versions of the Steel Joist Institute design manual with this joist type? I would like to know the capacity of this joist. If you know how the naming convention of the joists were changed that would be helpful too.
Any help would be appreciated.






RE: Open Web Steel Joist yr 1983 capacity
This is only for the H series though
RE: Open Web Steel Joist yr 1983 capacity
RE: Open Web Steel Joist yr 1983 capacity
Mike McCann
MMC Engineering
RE: Open Web Steel Joist yr 1983 capacity
I am in the process of checking the decking right now actually.
RE: Open Web Steel Joist yr 1983 capacity
Dave
RE: Open Web Steel Joist yr 1983 capacity
Yeah the building is in Portland Oregon, and they have a provision that states that if the loading is increases 5% from the original design (which was 1950's) then the building will need to be seismically upgraded. We are calling around to get more info on this provision, since it doesn't state whether or not it means the seismic weight (as in seismic base shear) or the factored loads are to be kept under the 5% max.
The building is so old that retrofitting it will not be cost effective. The client may decide to abort the green roof idea as a result.
RE: Open Web Steel Joist yr 1983 capacity