Built-up Crane Runway Girder
Built-up Crane Runway Girder
(OP)
I have a client who has modified his crane runway beams with plates connecting the edges of top and bottom flanges of the plate girder (see attached image). He wants me to analyze the section to determine an allowable crane capacity.
My plan is to ignore the interior web and analyze the section as a box section, using AISC LRFD section F7.
Any comments?
http://fil es.enginee ring.com/g etfile.asp x?folder=5 c722a79-07 74-490b-a9 81-0764965 6f7b6& file=Runwa y_Beam.jpg
My plan is to ignore the interior web and analyze the section as a box section, using AISC LRFD section F7.
Any comments?
http://fil






RE: Built-up Crane Runway Girder
RE: Built-up Crane Runway Girder
Why did they do this?
RE: Built-up Crane Runway Girder
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Built-up Crane Runway Girder
All that additional torsional strength might not be worth much if the boxing doesn't continue for the full length.
RE: Built-up Crane Runway Girder
The plates were added due to serviceability concerns.
In the design, weak axis deflection is the controlling factor. I am planning on using the exterior web plates only for lateral analysis.
If it becomes necessary to use the exterior plates for strength I would have to assume that the interior web cripples before the exterior webs are utilized, essentially eliminating the interior web in my design. Does this sound reasonable?
RE: Built-up Crane Runway Girder
RE: Built-up Crane Runway Girder
I'll be interested in how you calculate the shear in the welds for weak axis bending with that sloping plate.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Built-up Crane Runway Girder
Mike Halloran
Pembroke Pines, FL, USA
RE: Built-up Crane Runway Girder
RE: Built-up Crane Runway Girder
However, when we do these - we end up having to provide diaphrams on approx 72" centers due to web buckling. Assumes 1/4" webs. If thicker, this might go away.