Meso-Scale Study on Dynamic Shear Property and Size Effect of RC Beams Reinforced with CFRP

A three-dimensional mesoscale numerical analytical model for studying CFRP reinforced RC beams was developed using the ABAQUS finite element numerical calculation platform. The heterogeneity of concrete material and the interaction between rebar/CFRP and concrete was considered. Different strain rates were studied to explore the size effect behaviors and shear failure. The conclusions show that: 1) with the increase of the strain rate, the shear bearing capacity increases, and with the increase of the beam height, the nominal shear strength decreases; 2) increased strain rate can result in RC beams reinforced with CFRP having greater nominal shear strength, while it can also result in diminished size effect behaviors; 3) the nominal shear strength was predicted, a formula that considers both the size effect and the strain rate effect was proposed.