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Re: Expansion Joint in Staad Model

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Bill,
 
        I haven't been following this thread very closely so I might be sucking air as far as your actual question is concerned; never the less there may be a solution to your problem.
 
        If you're trying to simulate a compression only contact and your program doesn't do it directly you can do two separate runs.  Model your structure as two separate structures (or not, it doesn't matter if there are other connection points than the one being considered) providing short links with hinges on both ends connecting the structures.  Do two runs, one with the links active and one with the links inactive.  If you're using the program to do the actual design you may also have to make some load cases inactive to avoid erroneous solutions.
 
        If you have an actual gap you can still accommodate it. artificially shorten the link member by some way (such as using a very low temperature; but there may be other ways such as fabrication error if the program accommodates that).
 
        Just some thoughts.  Throw them out if they are not useful.
 
Regards,
 
H. Daryl Richardson
----- Original Message -----
Sent: Thursday, February 23, 2006 12:46 PM
Subject: Re: Expansion Joint in Staad Model

If they are two separate structures, and from Manny's description  it sounds like they are, pounding can be a very signifcant issue because one structure will likely zig when the other one zags. 
 
Bill Cain, S.E.
Berkeley CA
 
 
-----Original Message-----
From: Sherman, William <ShermanWC(--nospam--at)cdm.com>
To: seaint(--nospam--at)seaint.org
Sent: Thu, 23 Feb 2006 10:17:58 -0500
Subject: RE: Expansion Joint in Staad Model

These will act like two separate structures and should be modeled as two
separate structures.  Ignoring the expansion joint will allow load
sharing, which is not an accurate analysis.  


William C. Sherman, PE 
(Bill Sherman) 
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)cdm.com
 

> -----Original Message-----
> From: Manuel Zuniega II [mailto:mannyzuniega(--nospam--at)yahoo.com] 
> Sent: Thursday, February 23, 2006 1:16 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Expansion Joint in Staad Model
> 
> Hello list,
> 
> I just want to know how to consider the expansion joint in 
> staad model considering 1(one) whole structure with 20mm 
> width expansion joint. This EJ is at the center of the column 
> & beam all throught the vertical plane of the building from 
> roof to mat foundation. It looks like two(2)structures 
> joining together.
> 
> Another question is, what is the structural effect if i 
> ignore the expansion joint in structural analysis?
> 
> Thanks,
> manny
> 
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