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Re: "J" For Lateral Torsional Buckling equations

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On Nov 23, 2009, at 6:29 PM, Liaquat Ally Akhand wrote:

"J" is the polar moment of inertia.
For structural purposes J is the torsional stiffness. The polar moment of inertia is the torsional stiffness only for the special case of circular sections

It is the square root of summation of square of moment of inertia
about "x-axis" and "y-axis".
The polar moment of inertia is the sum of the cross-sectional moments of inertia, not the root-sum-square

You can find it in any standard Handbook.
Blodgett is your best resource. It explains everything

Just so you'll know.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)

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