STRUCTURAL PERFORMANCE OF PRECAST CONCRETE BEAMS WITH SPLICE-BAR JOINTS OF LONGITUDINAL BARS AT THE MIDSPAN

In this study, bending and shear tests were conducted to understand the seismic performance of reinforced concrete beams formed by joining together two precast beam-end elements at the midspan using cast-in-place concrete with splice-bar joints of main bars. A total of 11 specimens were used, and the parameters were the strength of main bars and cast-in-place concrete, transverse reinforcement spacing and the amount of U-shaped reinforcement in the lap splices region. As a result of the test, a design method for splice-bar joints necessary for flexural yielding of beam ends was developed. Also, a bond splitting strength evaluation method taking into account the effect of U-shaped bars and the influence of the stress gradient, developed by modifying evaluation formulas currently in use, was proposed.