Elastic Critical Load for Torsional Buckling

Elastic Critical Load for Torsional Buckling N_cr,T

N_{cr, T} = \frac{1}{i_{M}^{2}} \cdot (\frac{π \cdot E \cdot I_{w}}{L_{T}^{2}} + G \cdot I_{t})

i_{M} = \sqrt{i_{u}^{2} + i_{v}^{2} + u_{M}^{2} + v_{M}^{2}}

E	Modulus of elasticity
G	Shear modulus
I_w	Warping resistance
I_t	Torsion moment of inertia
i_u, i_v	Principal radii of gyration
u_M, v_M	Coordinates of the shear center in the principal axis system
L_T	Torsional buckling length

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