Experiments were conducted on ten reinforced concrete beams arranging second layer-cutoff bars to study the influence of the bond reinforcement upon bond splitting strength or anchorage behaviors. The longitudinal bars of beams were reinforced by transverse bars having different configurations (separated and closed types) and strengths (
σy=295 and 1275 N/mm
2). The bond strength of the second layer bars reinforced by separated type bars was almost equal to that reinforced by closed type bars. High strength bond reinforcement increased in bond strength by 30 %. Test results also showed that the bond strength of the second layer-cutoff bars were considerably higher than calculated value according to design guidelines of AIJ. A new reduction coefficient for the second layer-cutoff bars was proposed to reasonably estimate the bond strength for anchorage failure.
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