Torsional Constant T beams
Torsional Constant T beams
(OP)
Does anyone have the formula for J (Torsional Constant) for a T section beam in cm4?
or C Torsional Modulus?
Thanks
Andrew299
or C Torsional Modulus?
Thanks
Andrew299
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Torsional Constant T beams
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RE: Torsional Constant T beams
a general formula
J = Ix + Iy = I1 + I2
Assuming x & y axes (or axes 1 & 2) are orthogonal.
Hopefully you have the equations for the moments of inertia for a T-section, or can derive them from rectangular equations and the offset axis theorem. I can try and write them out, but they get a little hairy, and defining some of the terms will be difficult without a diagram. I'm using _Roark's Formulas for Stress and Strain_, W. Young, 6th ed., McGraw-Hill, 1989; see page 63.
Ben T
RE: Torsional Constant T beams
Thread194-92351
in the "Civil/Environmental Other" forum, where I have just placed a post.
RE: Torsional Constant T beams
andrew299: look in the site below, under Beams -> Cross sections -> I beams -> Cut : by clicking onto 'Formulas' you'll see your formula.
And if you could avoid cross posting...
prex
http://www.xcalcs.com
Online tools for structural design
RE: Torsional Constant T beams
If you are a member, you can download it in PDF. The design guide is an excellent source and reading on torsional analysis. It is full of charts for various boundary conditions not to mention torsional constants for various steel shapes ready for use.
Good luck