PENGARUH FIBER BENDRAT TERHADAP KUAT GESER BALOK BETON BERTULANG DENGAN SENGKANG

摘要

The research was conducted to prove experimentally that the ultimate shear strength of reinforced concrete beam would increase significantly when a certain amount of local fiber was added into the concrete mix. Six reinforced concrete beams with typical dimension of 120 mm x 240 mm x 1600 mm were made and divided into: (a) three beams were made of non fibrous concrete with vertical stirrups (code D1, D2, and D3), (b) three beams were made of fibrous concrete with vertical stirrups (code D1F, D2F, and D3F). The local fiber weight added into the mixture were 46.76 kg per cubic meter of concrete, Vf = 0.7%. Plain round steel bars with 16 mm diameters were used to provide the main tensile reinforcement. The yield stress of the steel was 446 MPa. Plain round steel bars with 16 mm and 10 mm diameters respectively were used to provide the main compressive reinforcement, the yield stress of the steel were 446 MPa and 379 MPa respectively. Plain round bars with 6 mm diameters were used to be vertical stirrups, the yield stress of the steel was 314 MPa. The beams were simply supported at two points, having spans of 1300 mm, and symmetrically loaded by 0.5 P at the point located 400 mm from the supports. The load was applied to the beams with an increment of ΔP = 1 ton until the beams ultimate capacity was reached. From the observation of the test result, it was concluded that the ultimate shear strength of local fibrous reinforced concrete beam increased 20% in comparition with the ultimate shear strength of the non fibrous reinforced concrete beams.