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Re: Welding of Crane Runways

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Gary,

        Contact Bob MacCrimmon.  Bob is working on a CISC Design Guide for crane supporting
structures.  He may have an answer to your question.

Regards,

H. Daryl Richardson

Gary Hodgson & Associates wrote:

> I am involved with a problem where a new crane runway was designed using a wide flange
> beam and cap channel with welds spaced at 9" apart.  There is a requirement in the
> Canadian code for welding that forbids intermittent welds in dynamically loaded
> structures except in compression zones and then those welds must not be spaced any
> further apart than 6" or 12 times the thickness of the thinner part, whichever is less.
>
> I have tried to find out where this requirement came from.  A few of my compatriots
> have suggested that it came from the AWS specification for structural welding.  If so,
> does anybody know the rationale behind it?  Incidentally, the stresses in the welds
> and base metal are relatively low.
>
> Thanks,
> Gary Hodgson, P.Eng.
> Niagara Falls, ON
>
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