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RE: "J" For Lateral Torsional Buckling equations

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Assuming J is the Torsion Constant. Then for open sections approximately


J = sum( bt^3/3)


Where b = length of element

           T = thickness


For special case of  circular section J equals the polar second moment of area.



Conrad Harrison

B.Tech (mfg & mech), MIIE, gradTIEAust



South Australia