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RE: Crane Columns and Girders

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We have used two approaches to this situation.  The first is to brace the
outboard columns with raker braces.  The other is to run a box girder with
interior stiffeners over the columns and tie the ends of the outside crane
girder back to the crane girder line and building columns with horizontal
struts.  Therefore you have say 20' vertical spans and a 80' horizontal span
for the outside runway.  Also, with the second approach fatigue becomes a
big consideration due to reversing stresses.

Ed Marshall, PE

> -----Original Message-----
> From:	Argue & Associates [SMTP:bemargue(--nospam--at)]
> Sent:	Thursday, December 17, 1998 4:12 PM
> To:	seaint(--nospam--at)
> Subject:	Crane Columns and Girders
> We are currently investigating the relocation of a 10 ton crane
> with a 5 ton auxillary.  The existing crane support system is
> one steel beam sitting on top of 2 isolated crane columns
> with the beam cantilevering out 66" each end.  The relocated
> crane system will be  about 80' long (instead of the 19'-6" c/c of
> columns).  Because of cost constraints, the owner wishes to use
> what ever steel can be salvaged.
> In the new location (existing building already built), one line of
> columns could be braced off the building columns, but on the other side
> the building columns are 25' away.  Any suggestions on bracing the other
> crane girder?
> Does anyone have experience sitting crane girders on top of columns?
> We have always preferred to extend the crane columns up and have a
> stub for the crane girders to sit on which eases in the detailing of
> supporting the compression flange.