Abstract
In Architectural Institute of Japan (AIJ) standard for structural calculation of reinforced concrete structures and General Building Research Corporation (GBRC) design guideline for mechanical anchorage in reinforced concrete joints, development length of R/C sub-beam reinforcement into main-beam is specified as the value speculated by the required development length of main-beam reinforcement into beam-column joint. However, this adequacy is not verified by the experiments in the past. In this study, a number of experiments are carried out to identify the anchorage strength and required development length of R/C sub-beam reinforcement using mechanical and bent anchorages. Main parameters of experiments are type of anchorages, development length, concrete strength, and detailing of reinforcement. Consequently, design equations on required development length and the allowable stress of R/C sub-beam reinforcement are proposed and design examples are demonstrated.
