SHEAR TESTS OF FIBER CONCRETE BEAMS WITHOUT STIRRUPS

This paper summarizes all available previous shear tests on fiber rein forced concrete beams without stirrups, and presents the results from 11 large-scale beam element tests. The beams had an overall depth of 6 10 mm (effective depth of 560 mm), and were constructed with varying a mounts of hooked steel fibers (0 to 1.5 percent by volume). Three spec imens were subjected to axial tension in addition to shear and bending . Increasing the amount of fiber was found to reduce the crack widths and increase the shear strength, the maximum increase in shear strengt h being 117 percent. The 50-mm-long fiber resulted in similar shear st rengths as an equal volume of 30-mm-long fiber, but considerably more ductility.