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(2) The non-dimensional slenderness
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| body | --uriencoded--$$ \normalsize \overline%7B\lambda%7D_T $$ |
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for torsional or torsional-flexural buckling should be taken as:
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| body | --uriencoded--$$ \normalsize \overline%7B\lambda%7D_T = \sqrt \frac%7BAf_y%7D%7BN_%7Bcr%7D%7D & \ |
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| qquad \qquad \text%7Bfor Class 1, 2 and 3 cross-sections%7D & \ |
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| qquad \qquad (6.52) \\ \overline%7B\lambda%7D_T = \sqrt \frac%7BA_%7Beff%7Df_y%7D%7BN_%7Bcr%7D%7D & \qquad \qquad \text%7Bfor Class 4 cross-sections%7D & \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad (6.53) $$ |
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where
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| body | --uriencoded--$$ \normalsize N_%7Bcr%7D = N_%7Bcr,TF%7D $$ |
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but
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| body | --uriencoded--$$ \normalsize N_%7Bcr%7D < N_%7Bcr,T%7D $$ |
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