Assessment of repaired reinforced concrete dapped-end beams exhibiting bond deterioration under static and cyclic loading

Abstract

An experimental investigation has been conducted to scrutinize the behavior of reinforced concrete dapped end beams repaired with different configuration of CFRP sheet under static and cyclic loading due to induced cracks from previous examination. The static load was adopted to determine the amplitude of cyclic loading at an increment of 15% until failure. It was demonstrated that retrofitting increased load capacity and ductility significantly; approximately 28% increase in capacity and 1.5 times higher ductility over the un-retrofitted beam under static loading, and approximately 80% higher capacity with three times increase in ductility and a change in crack orientation under cyclic loading. Nonetheless, the reentrant corner's significant concrete spalling is a major concern. It is thus essential to focus on the dapped section for monitoring and maintenance of this beam.