This paper deals with the shear capacity of existing reinforced concrete member with carbon fibre sheet, and mechanical behaviours of stirrup in concrete and carbon fibre sheet. Most of existing structures cannot be rounded with carbon fibre sheet except columns. In this study two types of reinforcement was examined, one was rounded with carbon fibre sheet, and the other was stuck to the side of concrete member. The results of this tests show that the reinforcement with carbon fibre sheet will improve the shear capacity. The strain of carbon fibre sheet differ from the strain of stirrup, and near the crack increase rapidly because fibre sheet was stuck to surface of concrete structures. Therefore fibre carry the higher shear strength than the strength calculated from the rate of fibre and stirrup.
