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How to calculate rz for single angles

How to calculate rz for single angles

How to calculate rz for single angles

(OP)
I'm working on a mathcad sheet that will calculate all the shape properties just by typing in the leg sizes and the thickness.  It'd help with saving time if I didn't have to look up and type out all the properties.  I've got most of the properties worked out, just not anything to do with the z-axis.

Specifically, I haven't been able to find out where or how they calculate the rz value.

ex. L6x4x3/4   -->   rz = 0.856"

RE: How to calculate rz for single angles

avalonlane,

rz=sqrt(Iz/A) where Iz is the minimum moment of inertia and A is the cross sectional area. Iz can be calculated from Ix, Iy, and Ixy using Mohr's Circle if x and y are centroidal axes of the cross section.

Note that the section properties you compute will approximate the values tabulated in the shape tables (as I assume that you are not modeling the fillets).

RE: How to calculate rz for single angles

Also...

AISC has excel spreadsheet tables of all the shape properties, including rz, that you could simply load in to your mathcad sheet.

I think they are either free, or very inexpensive.

 

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