| Fiber Reinforced Polymer (FRP) is currently used worldwide to repair or strengthen infrastructures such as bridges and buildings. This paper presents results of an experimental investigation on the shear response of reinforced concrete (RC) beams that were strengthened using FRP mesh and shotcrete. The strengthening materials were polyvinyl alcohol short fiber mixed shotcrete (PVA shotcrete) and Aramid FRP mesh (AFRPm) or Carbon FRP mesh (CFRPm). This investigation was carried out on four RC beams without stirrups: a plain RC beam; a RC beam strengthened using PVA shotcrete; a RC beam strengthened using AFRPm and PVA shotcrete; a RC beam strengthened using CFRPm and PVA shotcrete. These strengthening materials were applied to sides and bottom surface of these beams. These beams were tested under four point static load conditions. Experimental results indicate that this strengthening method using FRP mesh and PVA shotcrete increases the shear capacity of each beam. Furthermore、 the results of experimental tests were compared with calculated values in this paper. These shear capacity increase of PVA shotcrete and FRP mesh were calculated by equations based on the ultra high strength fiber reinforced concrete、 and FRP sheet jacketing、 respectively. As a result、 it was suggested that the improvements of shear capacity by this strengthening method were possible to evaluate by a combination of these proposed equations.[*][*]ＦＲＰは橋梁等の構造物の補修・補強に広く用いられている。本論文では，ＦＲＰメッシュと吹付けコンクリートによって補強したＲＣ梁のせん断耐力について実験的検証を行った。補強材料には，ポリビニルアルコール短繊維を混入した吹付けコンクリート（ＰＶＡ吹付けコンクリート）とアラミドＦＲＰメッシュ（ＡＦＲＰｍ），カーボンＦＲＰメッシュ（ＣＦＲＰｍ）を使用している。本研究では，無補強，ＰＶＡ吹付けコンクリートのみで補強，ＰＶＡ吹付けコンクリートとＡＦＲＰｍで補強，ＰＶＡ吹付けコンクリートとＣＦＲＰｍで補強の４ケースのせん断補強筋のないＲＣ梁を用いて，静的載荷実験を行った。なお，これらの補強材料はＲＣ梁の側面と底面に施工されている。これらの実験結果から，ＦＲＰｍとＰＶＡ吹付けコンクリートを使用した補強工法は，ＲＣ梁のせん断耐力を向上させる効果が確認され，また，このせん断耐力の向上効果は，高強度繊維補強コンクリートやＦＲＰシート工法における計算式に準じた式を用いて評価できることが示された。 |
