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RE: Principal Section Properties

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Calculation of basic geometrical section properties are based on the
geometry of the section, not on stress and strain.  Stress and Strain
are value which can be obtained by using geometrical section properties.
You cant calculate stress or strain without first knowing what the
section properties are can you?  As for the principal axis section
properties, you can find the angle between the geometric and principal
axes using mohr's circle.  Now that you know that angle, you can find
the section properties about the principal axes using the geometrical
properties about those axes.  

-----Original Message-----
From: Roger Turk [mailto:73527.1356(--nospam--at)compuserve.com]
Sent: Monday, April 05, 1999 3:53 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Principal Section Properties


Zachary Goswick wrote:

. > Mohr's Circle has nothing to do with calculation of section
properties.

Oh, c'mon now!  If you believe this, then it is time for a thorough
review of 
basic Strength of Materials!

A. Roger Turk, P.E.(Structural)
Tucson, Arizona