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RE: Greetings!

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I think you will find for yourself where a space frame will be more
appropriate than a truss structure or visa versa. My experience with 3D
space frames has been that in some cases the structure has become unstable
due to too many releases. In the past I have used truss specification more
successfully on 2D structures that are truly trusses. In regards to other
questions regarding the manner of computation of Kv, have you contacted
REI's support?

-----Original Message-----
From: arman s rivera [mailto:asrivera(--nospam--at)]
Sent: Thursday, October 05, 2000 10:49 PM
To: seaint(--nospam--at)
Subject: Greetings!

Dear fellow engineers!


I am Arman Rivera, a practicing structural engineer in the Philippines.  Our
firm recently purchased the software Staad Pro 2000 and from the limited
hands-on I have had on it, this software is remarkable.  However, as I've
been reading the manual that came with the software, I have many questions
regarding it.  Is anybody familiar with Staad Pro 2000 that won't mind
answering questions from a novice user?

I've been using Staad Pro 2000 to design communication towers.  My first
question is, should the tower be classified as SPACE or TRUSS?  What I've
done is to treat it is a space and then assign the moment releases at the
end of the diagonals and verticals only (not the main posts), so that these
members would carry only axial forces.  Is this correct?

My next question is on the support conditions.  I have modeled the mat
foundation using finite elements in Staad Pro 2000.  I have defined the
joint supports as ELASTIC MAT by specifying the modulus of subgrade
reactions (kv).  Given the allowable soil bearing capacity, how is the
modulus of subgrade reaction computed?

I have many more questions regarding this software, any help you could give
me would be greatly appreciated.

Thank you very much.

Arman S. Rivera