Unbraced length of girders supporting a monorail
Unbraced length of girders supporting a monorail
(OP)
I'm working on a frame right now that has 4 monorails on it. There are girders with S section monorails bolted to the bottom flange of the girders. I have these modeled as fixed moment connections but my question is about the unbraced length of the girder. Right now I am assuming the beam is unbraced across the entire length, even though the bottom flange is "brace" by the top flange of the monorail. Does this seem like a reasonable approach?






RE: Unbraced length of girders supporting a monorail
1) You're confident that the connection between beams can couple monorail flexure to girder torsion and;
2) You evaluate the stiffness of the monorail bracing scheme for it's suitability as bracing. AISC has checks for that.
Note: I'm not especially well versed in industrial work.
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Unbraced length of girders supporting a monorail
RE: Unbraced length of girders supporting a monorail
RE: Unbraced length of girders supporting a monorail
The girder unbraced length should be 38 to 40 and 40 to 41.
RE: Unbraced length of girders supporting a monorail
I'm also modeling it defining all braces as truss members as opposed to tension only because I get instabilities due to "leaning of structure" because eccentric loading. I get some failures of 2L4x4 angles under compression. adding more braces my help that but then again, not saving any money because I'm adding more connections and steel.
RE: Unbraced length of girders supporting a monorail
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Unbraced length of girders supporting a monorail
RE: Unbraced length of girders supporting a monorail
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Unbraced length of girders supporting a monorail
RE: Unbraced length of girders supporting a monorail
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Unbraced length of girders supporting a monorail
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Unbraced length of girders supporting a monorail
RE: Unbraced length of girders supporting a monorail
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Unbraced length of girders supporting a monorail
RE: Unbraced length of girders supporting a monorail
RE: Unbraced length of girders supporting a monorail