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RE: Master-Slave Joint

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It's been a few years since I used STAAD, so REI may have fixed it. However,
for some time the software was not capable of CORRECTLY imposing relative
constraints at the joints.  A translation or rotation imposed on the master
joint did not produce the correct internal forces in members connected to
the slave joints.

If anyone knows that this shortcoming has been corrected, perhaps they could
make a comment. They could also provide a discussion as to why the software
didn't work in the past.

Until then, the only way to be sure is to test a small 3-d model.

-----Original Message-----
From: Rogers, Robert [mailto:Robert.Rogers(--nospam--at)]
Sent: Monday, October 11, 1999 3:34 PM
To: 'seaint(--nospam--at)'
Subject: RE: Master-Slave Joint

I'm a little confused by this statement.  In STAAD, members are defined by
connectivity from joint to joint.  Since global displacements are calculated
at the joints I would think that it is implicit that the individual member
section displacements would be derived from the displacements at the joints
(as well as effects due to loading) that are behaving as part of a rigid
diaphragm.  What are you getting at with your comment ?

Robert Rogers, PE
Woolpert LLP
409 East Monument Avenue
Dayton, Ohio 45402

  From: Rex Donahey [mailto:rdonahey(--nospam--at)]
  I recall that only the JOINTS are slaved.  The MEMBERS are not.