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Re: Crane Columns and Girders

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If what you have typed is correct, then in the new design the crane girder
will have an overhang of 363"(30'3") as against existing 66", with the
interior span of 19'6". Seems very unusual to me. You could have significant
uplift on one of the supporting columns.  Make sure that the column base
connections are adequate. You will be ending up with a fairly heavy girder.

Is the crane running on top of crane girder? I believe it is, since the
girder is set on top of columns.  In this case, it would be far more
economical to erect two new columns at either ends of the new crane girder.
It is an interesting problem.  Did I understand it correctly? Please respond
to this initial response from me.


Argue & Associates wrote:

> 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.