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RE: Master/Slave (Was STAAD or RISA?)

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I believe one use of slaving nodes together (in some programs, anyway) is to
similate a rigid diaphragm that is tying all the nodes together, and
enforcing a unform displacement for the group.  ETABS does a similar thing
for all the nodes at each level, since a rigid diaphragm is assumed (unless
you tell it otherwise).  In that application, rotation of the member ends at
each node is allowed, so long as the nodes stay in the same plane and stay
at the same positions relative to one another.  

Paul Crocker, PE, SE

-----Original Message-----
From: Daryl Richardson [mailto:h.d.richardson(--nospam--at)]
Sent: Friday, September 06, 2002 4:38 PM
To: seaint(--nospam--at)
Subject: Re: Master/Slave (Was STAAD or RISA?)


        Thanks for bringing this Master/Slave thing up.  I have never
properly understood it.

        As I see it making a group of nodes slave to one other node makes
ALL of the degrees of freedom for the group the same.  This means that the
group can move "en mass" but can not rotate since rotation would some nodes
to move more than others (ie. rotate about some axis).  I can't visualize
any practical use for this feature.  If anyone can clarify the real use of
this Master/Slave thing I would appreciate it.

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