ANALYSIS OF REINFORCEMENT PRESTRESSING IMPACT ON THE BEARING CAPACITY OF THE DAPPED-ENDS

Abstract

The article analyzes a prestressed reinforced concrete dapped-end beam of a rectangular cross-section. The negative effect of reinforcement prestressing on the bearing capacity of the dapped-end is analyzed. The numerical beam model is made based on an experiment and a nonlinear analysis is performed using the DIANA FEA software package to determine the effect of different intensity of reinforcement prestressing on the bearing capacity of the dapped-end beam. The results are compared with analytical calculations and the behavior described in the literature. The prestressing of the reinforcement is shown to reduce the bearing capacity of the dapped-end when tensioned reinforcement is not extended to the end of the beam above the notch. The load capacity of the numerical model is reduced by 9.67% and reduced by 25% based on analytical calculations. When designing dapped-end beams, it is necessary to assess the effect of reinforcement prestressing on the bearing capacity and cracking.