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Re: Allowable horizontal deflection of column

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> From: G Vishwanath <gvshwnth(--nospam--at)>

> Sub: Allowable horizontal deflection of column.

> Use your judgement and discuss with the client if he
> is knowledgeable.
> Or else simply follow height/325 as the limit which I
> use and so far no one has asked me why.

Deflection limits are generally limited by two things:
1) strength/stability (e.g. second order effects)
2) function/service (e.g. attachments and crane operation)

> But this limit is too strict for pre engineered
> buildings.

I disagree strongly. There is no reason why a pre-eng building could not
be designed for any restriction you might place on any other steel
framed structure. After that, the issue becomes cost and engineering

Paul Ransom, P. Eng.
Burlington, Ontario, Canada
<mailto:ad026(--nospam--at)> <>

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