τ_b Factor for αP_r/P_ns > 0.5

τ_b when αP_r/P_ns > 0.5

τ_{b} = 4 ({αP}_{r} / P_{ns}) [1 - ({αP}_{r} / P_{ns})]

α	= 1.0 (LRFD); 1.60 (ASD)
P_r	Required axial compressive strength using LRFD load combination or ASD load combinations, kips (N)
P_ns	Cross-section compressive strength; for nonslender-element sections: P_ns = F_yA_g, for slender-element sections: P_ns= F_yA_e, where A_e is as defined in Section E7, kips (N)

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