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# Cold Formed Steel2

## Cold Formed Steel

(OP)
I am checking a design of some cold formed Steel Z shape purlins.  I haven't worked with this material before.  I have the 1996 cold formed steel design manual put out by AISI and am learning with the examples.  I have gotten through the effective section properties example I-10.  There is one value that I cannot find where or how to calculate....In the table where the moment of inertia is determined they find a y distance from the extreme fiber of the section ...the last 2 distances .202 (to the top lip) and 7.649(to the bottom lip) have worked for hours and I can't seem to get these numbers...If anyone has had this problem or can help me out I would appreciate any help

### RE: Cold Formed Steel

Hi
Jest Chek it out this book surly you may get answer " Cold-Formed Steel Design by Wei-Wen Yu, Ph.D., P.E.
by
sreedhar

2

### RE: Cold Formed Steel

One thing I have experienced with cold formed shapes is that manufacturers gauge thickness can vary. Such as 16 gauge from one source may be a different thickness than 16 gauge from a different source. If you are checking an existing member, it may be a good idea to measure it's actual thickness then calc it's properties.

### RE: Cold Formed Steel

(OP)
Thank for the Input.  I found the answer!

y=r*(1-cos(gamma))+t/2+((c*sin(gamma))/2)=.202

where c is the length of the lip

### RE: Cold Formed Steel

Dear Folks

On-line design of the Light-Gage /Cold-Formed steel using "1996 AISI Design Specifications"  are now avilable on my web page including C-Section propertie, effective sectional properties, shear capacities, web-cripppling capacites, determinations of safety fators, screw connection capacities and 2D Plane frame Analysis.

Thanks

### RE: Cold Formed Steel

Hi!

On-line design of the Light-Gage /Cold-Formed steel using "1996 AISI Design Specifications"  are now avilable on my web page including C-Section propertie, effective sectional properties, shear capacities, web-cripppling capacites, determinations of safety fators, screw connection capacities and 2D Plane frame Analysis.

Thanks

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