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The 90-degree bend is generally used at the end of beam reinforcements in the exterior R/C beam-column joint. When the development length of the hook is short, a type of failure modes that the column concrete is raked out may occur. In AIJ Standard for Structural Calculation of Reinforced Concrete Structure, the capacity formula of raking-out failure is presented in the case there is no option but to let the anchorage reinforcements short. In this paper, the former capacity formula is evaluated using the experimental data from 2011 to 2013 including specimens with stepped column. The coefficients in the formula are considered like as follows: 1. A formula based on lever model was proposed for hoop component force to examine correspondence to the current formula. 2. In addition, the former capacity formula was compared to another one that a change was added for concrete component force based on arch model.

REEVALUATION OF ULTIMATE ANCHORAGE STRENGTH EQUATION FOR 90 DEGREE HOOK IN EXTERIOR BEAM-COLUMN JOINT IN MODE OF CONCRETE BEING RAKED OUT