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Experiments were performed on ten reinforced concrete beams having second layer-cutoff bars to study the influence of the bond reinforcement upon bond splitting strength and cracking behaviors. The second layer bars have three different cutoff lengths and been reinforced by transverse bars of various configurations including opened type for easy construction. Test results showed that the bond stress at the tip of second layer bars were increased rapidly and degraded before peak loads, and that reinforcement effect of opened type bars were reduced to 60% of closed type bars. FE analyses for three type transverse bars were also carried out to investigate reinforcement effect against bond splitting only due to the wedge action of deformed bar, and provided valuable information about the effect of the transverse bars on the bond splitting behaviors.

BOND BEHAVIORS OF SECOND LAYER-CUTOFF BARS REINFORCED BY TRANSVERSE BARS HAVING VARIOUS CONFIGURATIONS