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Re: Link in Columns

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I'm going to agree with Paul Feather.  Placing links in columns is a poor
design concept.  Links in eccentrically braced frames are intended to deform
and absorb energy in a seismic event.  If the links are in the columns, then
the columns will intentionally deform, thus compromising the integrity of
the gravity load resisting system.  In my mind, this in an open invitation
for the building (or portions of it) to collapse.

Not a good idea.

Conrad Guymon, P.E.


----- Original Message -----
From: "Joseph Harouni" <yosi_h(--nospam--at)msn.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Monday, June 04, 2001 5:48 PM
Subject: RE: Link in Columns


> I am actually using Inverted V brace frame, that the bottom of the brace
> connection is 8 feet above base (foundation), in a 2 story building with
2nd
> floor 16 feet above base and roof 18 feet above the 2nd level (this upper
> level has cross bracing). You mentioned " DO NOT place the link in the
> column" any reason for that?
> Thanks,
> Joseph Harouni
>
> -----Original Message-----
> From: Paul Feather [mailto:pfeather(--nospam--at)san.rr.com]
> Sent: Monday, June 04, 2001 1:22 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Link in Columns
>
>
> Are you referring to a K brace?  if so, there is limited acceptability in
> the code for K braces in zone 4, but I do not know a single engineer who
> would actually use this configuration.  Historically this type of braced
> frame has performed very poorly.
> If you use a K brace there are very strict requirements for column
> performance that in essence will make this option particularly
> un-economical.
>
> If you are asking about links in terms of eccentric braced frames, DO NOT
> place the link in the column.
>
> Paul Feather
> San Diego, CA
> ----- Original Message -----
> From: "Joseph Harouni" <yosi_h(--nospam--at)msn.com>
> To: <seaint(--nospam--at)seaint.org>
> Sent: Monday, June 04, 2001 10:38 AM
> Subject: Link in Columns
>
>
> > Hi,
> > Does code allow design of LINKs in columns vs. in beams when designing
in
> > zone 4 based on Seismic Provisions (which essentially is an inverted V
> brace
> > (Chevron Brace) or Knee Brace)?
> > Thanks,
> > Joseph Harouni
> >
> >
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