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RE: Allowable horizontal deflection of column

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Dr. Geshwindner is now VP for engineering and research of AISC.  Charlie
posted this news to the list several months ago.  You can reach him at:
geschwindner(--nospam--at)aisc.org.

HTH,

Scott
Ypsilanti, MI


On Fri, 20 Dec 2002, Tom Bodkin wrote:

> I know Dr. Louis Geschwindner, Jr. has done a lot of work for AISC on
> "Leaning Columns".  He is referenced in the AISC LRFD Manual 3rd edition on
> page viii, and in the commentary on leaning columns.  If anyone knows about
> the subject, it has to be him.
>
> Maybe Charles Carter can get you in touch with him.  Dr. Geschwindner was my
> professor at Penn State and has contributed a great deal to the Steel code
> on this subject.  Good Luck and tell Gesch I said hello.
>
> Tom Bodkin, E.I.T.
>
> -----Original Message-----
> From: G Vishwanath [mailto:gvshwnth(--nospam--at)yahoo.com]
> Sent: Friday, December 20, 2002 4:20 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Allowable horizontal deflection of column
>
>
> Sub: Allowable horizontal deflection of column.
>
> Anirban,
>
> Ref: Your question.
>
> I too have thought about this.
> The AISC specs are also silent on this.
> I think this is a deliberate policy.
>
> The Indian code is specific.
>
> But perhaps, it is not appropriate to specify this
> limit and it should be left to an engineer's judgement
> and his discussions with his client.
> Rightly so.
>
> So many factors are involved.
> The nature of the side covering(brick, glass, steel
> cladding etc , the function of the building, the
> effect of horizontal movement on the funtioning of the
> building etc. influence what this limit should be.
>
> In Industrial buildings, with overhead cranes, there
> should be strict limits.(1/1000 of crane rail height
> subject to a maximum of 15 mm?)
> But for ordinary warehouses and pre engineered
> buidings it could be more liberal.
>
> I am afraid there may not be a satisfactory  answer to
> this question.
> 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.
> But this limit is too strict for pre engineered
> buildings.
>
> Let me know if you learn something on this subject.
>
> Regards
> G Vishwanath
> Bangalore
> India
>
>
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