The R value could be expressed as R = ^sub o^[function of]'^sub c^^sub o^(1 ^sub o^^sub o^h) (19) where ^sub o^ is the depth coefficient of compressive force from the actual concrete stress block at its centroid = C/bh[function of]'^sub c^; ^sub o^ is the distance coefficient of compressive force to the top of the beam; is the coefficient of depth with respect to neutral axis; h is the depth of the neutral axis of the beam; C is the concrete compressive force from actual concrete stress block at its centroid; and [function of]'^sub c^ is the concrete cylinder compressive strength at 28 days; 5. Toyama, K., et al., "Inelastic Lateral Buckling Behavior of H-Shaped Steel Beams-Column," Summaries of Technical Papers of Annual Meeting of the Architectural Institute of Japan, July 2006, pp. 831-832. (in Japanese) 24.
Park and Paulay22 have also discussed this topic and REFERENCES remarked that “Lateral torsiona
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