Mohr's Circle has nothing to do with calculation of section properties.
Alpha is given. r(z) is given. Like I said, I can backsolve for I(z);
But that is not the question. The question is "Are the principal axis
section properties tabulated anywhere?"
From: Roger Turk [mailto:73527.1356(--nospam--at)compuserve.com]
Sent: Monday, April 05, 1999 1:45 PM
Subject: Principal Section Properties
The AISC manual that I have gives enough information that the properties
about the principal axes can be calculated. Doesn't I = r^2*A ???
r(z) given???? Isn't alpha given??? Remember Mohr's circle???
A. Roger Turk, P.E.(Structural)
Zachary Goswick wrote:
. > I am looking for principal (not geometric) section properties of a
. > single unequal leg angle because the design (according to AISC steel
. > manual "Specification for Allowable Stress Design of Single-Angle
. > Members" section 5.3.2 calls for Moment of Inertia about the
. > z-axis(minor principal axis) and the Section modulus about the
. > w-axis(major principal axis). Given (rz) and the area, I can
. > for the Iz, but calculating the Section modulus about the w-axis is
. > another story. AISC manual does not have any of these values
. > I was trying to find out if they are tabulated anywhere else.