Recently , mechanical anchorages are frcquently used for high−strength a 皿 d thick reinfbrcements because of congestion of reinfbrcements in bcam −column joint . Many researchers havc aggressivcly studied on the anchorage strength ofbeam reinforcement and the ultimate strength of R / C exterior bearn ・ column join も however , these structUral perforr lances could not be evaluated for yarious sorts ofmechanical anchorages . In this paper , the authors propose the evaluation method ofthe

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... strength ofbeam reinforccment on the basis ofpast experimcntal studies . Consequently , the authers clarify the design criteria en the ultimate strength of RIC exterior beam ・ column joint to ensure the ductility at the beam end .