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Cw

Cw

(OP)
Torsional warping constant.For certain hat channel section, I can draw in section wizard and can obtain all values except Cw. How to manually calculate it.

RE: Cw

In the first site below, under
Beams -> Cross sections -> User defined -> Torsion: from dxf
there is a sheet for calculating torsional properties of any section defined by a drawing.
Roark has a formula for a hat section, not sure whether it is exactly what you are looking for.

prex
http://www.xcalcs.com : Online engineering calculations
http://www.megamag.it : Magnetic brakes and launchers for fun rides
http://www.levitans.com : Air bearing pads

RE: Cw

The method of calculating Cw is given in "Cold-Formed Steel Structures" by Wei-Wen Yu.  Expressions for hat sections and other cross sections are tabulated in Appendix B.  

BA

RE: Cw

(OP)
I am not familiar with mathcad. Does any body has in Excel or any formula for hat channels.

RE: Cw

A quick search of the internet provided an article on calculating the warping constant. http://www.ceric.net/kssc/KSSC_3_2007_7_4_297(C).pdf . I have not read the article, but it looks interesting. For hat channels, the article has the same formula as AISI's Cold-Formed Steel Design Manual 2008 edition.


 

RE: Cw

(OP)
section wizard does give Cw Value also.It lists it as Iw = Sectorial moment of inertia

RE: Cw

dgkhan, i am using ShapeDesigner Saas (www.mechatools.com) to compute torsion, warping properties and related stresses, is really simple and efficient and for the price is really interessting it costs me only 99$. hope this helps. and good luck.

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