Abstract：In order to reveal the effect of different reinforcement amount of grid unit on the shear behavior of reinforced concrete (RC) beams strengthened by carbon fiber reinforced polymer grid (CFRP grid)polymer cement mortar (PCM) and to establish the calculation method for the bearing capacity of RC beams strengthened by CFRP grid-PCM, seven RC beams strengthened with CFRP grid-PCM were tested under four-point bending static loading. Based on the experimental results, a formula for calculating the bearing capacity of RC beams strengthened with CFRP grid-PCM is proposed, which is based on the actual shear contribution of transverse and vertical bidirectional grids. The results show that CFRP grid-PCM composite reinforcement can significantly improve the shear capacity of RC beams, in which the CFRP grid plays a major role in improving the shear capacity, while PCM only acts as a binder. The shear capacity of strengthened beams is positively correlated with the unit reinforcement amount of CFRP grid, but the cooperative deformation of CFRP grid is negatively correlated with the unit reinforcement amount of CFRP grid. The proposed formula is validated through the comparisons between the prediction and the measured shear capacity of RC beams strengthened with CFRP grid-PCM.
