Abstract
Since the Great Hanshin Earthquake, the demands of people who own buildings have changed: they want to use the buildings again with small repair cost. This requires good repairability of RC members. A beam with diagonal reinforcements is very ductile, however, the diagonal reinforcements yield on the tension side only because concrete struts will work with them on the compression side. When the diagonal reinforcements yield under tension, tension stress is applied to the concrete along the whole length by bond stress. This increases the number of concrete cracks. The results of this experimental investigation demonstrated that unbonded diagonal reinforcements are an effective means to reduce damage to short beams and have the same energy dissipation ability as bonded ones. A small design at the end of the beam can make the diagonal reinforcements yield on the compression side, and not increase the beam length.
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