Experimental Study on Shear Resistance of Steel Fiber Reinforced High-Strength Concrete Beams

摘要

To improve the toughness and shear resistance of high strength concrete, steel fiber was induced into the reinforced high strength concrete beams. 39 steel fiber reinforced high strength concrete (f_(cu) = 52.4 ～ 84.7 MPa) beams with stirrups and 5 control beams were tested. The test program was divided into two series. One series was tested under two symmetrical point loads, and the other was tested under an equivalent uniformly distributed load simulated by eight symmetrical point loads. The main variables were steel fiber volume fraction, steel fiber type, stirrup content and concrete strength. The test results showed that deformation properties, diagonal cracking strength and shear strength of the beams were improved significantly by the addition of steel fibers. Based on the test results, some empirical formulas are given to predict the diagonal cracking strength and shear strength of steel fiber reinforced high strength concrete beams. Results are also coordinated with those for reinforced concrete beams.