Cold Formed Steel 2

[par060]

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

 

[ksreedhar]

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

 

[WITT55]

I found a good program that you can down load to help you design cold form steel. Its called CFS and the light version can be down loaded for free at

http://www.rsgsoftware.com.

 

[haynewp]

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.

 

[par060]

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

 

[deejay]

AISI has a software for free download that allows you to calculate the gross and effective section properties. This program is based on MathCad. This can be easily downloaded from the AISI web site

 

[jimmyonline]

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.

Link:

http://www.geocities.com/n_c_46322

Thanks

 

[jimmyonline]

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.

Link:

http://www.geocities.com/n_c_46322

Thanks