Warping Constant Cw
Warping Constant Cw
(OP)
I'm have trouble finding how to calculate the warping constant of a doubly-symmetric cruciform shape.
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RE: Warping Constant Cw
However, if your 'flanges' (for lack of a better term) are sufficiently thin, say bf/tf > 10... I don't believe warping needs to be considered (don't quote me on that though- you'll need to check literature to confirm that). You can essentially treat it the same as a thin closed tube (ie calculate a Jeff value: sum(bt^3/3)).
If your 'flanges' are thick... then your in trouble (just kidding)...
In either case you will want to search through some papers on this subject... i'm sure this has been researched... some key words you will want to use: warping function, sectorial area and restrained warping.
RE: Warping Constant Cw
RE: Warping Constant Cw
RE: Warping Constant Cw
I believe warping can be neglected because all 'legs' (as long as they are sufficiently thin) of the cruciform pass through the shear center... where as with I beams (flanges) or angles (legs), which are offset from the shear center, can develop significant warping.
I developed expressions for torsion of thin-open sections, I'd be happy to share it with anyone who is interested.
RE: Warping Constant Cw
Note however what the paper says on the small value of CW for angles and Tees, confirming what was said above.
mh819, I'm interested in your expressions. You can use an email from one of the sites below to communicate.
prex
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