The structural design of a reinforced concrete building aims at performance based design. With upgrading of required performance, the demand for the building changes to be used with small repair cost even after a severe earthquake. RC members are required to evaluate the damage, and also required good reparability. A beam with de-bonded diagonal reinforcements is very ductile and has good reparability even used as a short beam. To evaluate the load resisting system and the condition of damage level of a member, parametric experimental tests were carried out and a load-carrying model was proposed. After applying this model to the tested results, the design method with less damage was evaluated and investigated by FEM analysis.
