Abstract
ABSTRACTCurrent design codes prescribe the development length of a reinforcing bar based on test results under static loading. In the present study, the development length of the reinforcement bar for reinforced concrete beams under impact loading was evaluated. Three-point impact loading test was performed on 16 partially bonded reinforced concrete beams to investigate the effect of loading rate on the bar development length. The test parameters were drop heights of the hammer, rebar diameter, and bar development length. The structural performance including the impact load, mid-span deflection, crack distribution, and rebar strain was evaluated. Although the bar development length was shorter than the design requirement under static loading, beam rebars were yielded under impact loading. For verification, a nonlinear numerical analysis result addressing the strain rate effect of concrete and reinforcing bars and the confinement effect of stirrups was compared with the test result. Further, considering the strain rate effect and nonuniform bond stress distribution model, a new design method was proposed to predict the bar development length under impact loading.
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