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RE: Question regarding seismic joints

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In regard to comments from Ben and others,
I am not familiar with your codes, but should there not
be any exemptions, but rather just different degrees
of separation?  That sounded familiar-wasn't that a
movie?
Gary


On 23 Apr 2004 at 12:06, Benjamin Cornelius wrote:

> Thanks, Mark.  I suspect you are correct about pressure from
> developers.  I have been thinking more about this.  My addition is to
> an existing building that was not originally designed for seismic
> loads, just wind.  The system is such that it will almost definitely
> not stand up to the code prescribed loading.  Should the design
> earthquake occur, the existing building would likely fail and possibly
> impact the addition, which makes me ask the question:  what am I
> accomplishing by providing this seismic joint?  Perhaps I am
> protecting the EXISTING BUILDING from the addition.  Or perhaps I am
> providing increased protection to the combined building during a
> smaller event.  But, logically, I am not preventing pounding in the
> event of the design earthquake.  Any thougts?
>
>
> >From: Mark Gilligan <MarkKGilligan(--nospam--at)compuserve.com>
> >Reply-To: <seaint(--nospam--at)seaint.org>
> >To: "INTERNET:seaint(--nospam--at)seaint.org" <seaint(--nospam--at)seaint.org>
> >Subject: RE: Question regarding seismic joints
> >Date: Fri, 23 Apr 2004 02:35:39 -0400
> >
> >The reality is that if adjacent buildings are not seperated enough
> >they will pound together.  Pounding buildings can either damage
> >columns thus leading to collapse or the pounding can increase the
> >acceleration that each structure sees.
> >
> >The formulas are compromises that are expected to control but not
> >eliminate damage.
> >
> >Many jurisdictions (both on the East coast and the West coast)  have
> >turned a blind eye to these seperation provisions at property lines.
> >Just think how developers would respond to reducing the floor platein
> >a tall building because of seismic joints.  The fact that separation
> >joints are not mentioned for seismic design catagories B and C might
> >be influenced by these same pressures.
> >
> >You should keep these three points in mind whenever deciding the size
> >of seismic joints.
> >
> >Mark Gilligan
> >
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