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Re: Structural steel--isolated joints

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Can you give any more information on this building.  i.e. bay size, crane
beam and cap channel (if there is one?) size, is this a bracketed crane (I
hope not), separate columns, or stepped columns, are there rail clips or J
hooks (I hope not), are these 1/4" plates used to brace the top flange to
the column, etc., etc.  How tall is this crane (i.e. rail ht, bracket or top
of crane column ht)?

Can you also describe the connection which I seem to understand you to say
is causing the column to fracture.  Just generally it would seem that a 6"
pipe column is extremely light to support a 32 ton crane.

Jim Hannah, EIT


----- Original Message ----- 
From: "Rand Holtham, P.E." <rand(--nospam--at)sigmaengineers.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Monday, August 09, 2004 12:09 PM
Subject: Structural steel--isolated joints


>
> I'm looking at an existing manufacturing building that has experienced
> fatigue fracturing of some 6" pipe columns that are connected to a crane
> rail beam by a 1/4" plate. It is apparent that the vibration of the 32 ton
> crane has caused the fractures. Luckily the columns are easily replaced
but
> when reattaching the lateral support for the crane rail beam I would like
to
> incorporate an end plate to end plate connection that has isolators or
> rubber washers or something to dissipate some of the vibration. Does
anyone
> have any leads that would help me fine tune this design?
>
> TIA,
>
> Rand
>
>
>
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