STUDI PENGARUH SABUK GFRP DIAGONAL TERHADAP KUAT LENTUR BALOK BETON BERTULANG

Abstract

Some researches have shown that critical phenomena on the use of FRP sheets as external reinforcement is debounding between the FRP sheet and concrete. This research was done to investigate the effect of Diagonal GFRP belt on failure behavior and flexural strength of reinforced concrete beam with additional 1 layer of GFRP sheet. The test was done on reinforced concrete beam specimens with dimension of 150 x 200 x 2500 mm on 2 simple support and were loaded using 2 point concentrated loads at 975.5 mm from the supports. Specimens were made in 4 group, without the addition of layers of GFRP beams, beams with the addition of one layer of GFRP without the belt and with the addition of 1 layer of GFRP beams with Diagonal GFRP belt. Each group consists of 2 specimens. The data observed during the test are cracking loads, crack patterns, crack widths, ultimate load capacities, deflections and failure modes. The results showed that with the addition of GFRP Diagonal belt can change the mode of failure of the release of the bond between GFRP and concrete for beams with the addition of one layer of GFRP without belts to break GFRP sheets to the beams with Diagonal GFRP belt. Use of GFRP Diagonal belt can also improve the bending strength of reinforced concrete beams. When it is compared with the control beam (without the addition of GFRP sheet) for beam bending capacity with the addition of 1 layer of GFRP without a belt, to increase the load by 122%, while for the beam with the addition of 1 ply GFRP GFRP Diagonal belt by 141,5 %