Shear Resistance of Steel Fiber Reinforced Concrete Beams

from the experimental observation and the theoretical analysis repOt1ed 111 this paper, the following conclusion can be drawn: 1- The pattern of cracks developed in fiber reinforced concrete beams subjected to shear was found to be generally similar to these observed in. the corresponding reinforced concrete beams with conventional stirrups. The number of cracks in the steel fiber reinforced concrete beams is more than that of the stirrup beams and its wide is smaller than it is. ’J- The mode of failures changed from shear to moment type when the volume fraction of fibers was increased to an optimum value. In the series tested (Beams FI to F6), this value was 1.2% the tests confirm that steel fibers are very effective in resisting shear failure.3- Catastrophic shear failure could be avoided in steel fiber reinforced concrete beams by using high percentage of fibers.4- The addition of fibers reduced the severity of the failure mode and increased the splitting resistance.5- Tl~e first crack shear strength in ~ber conc~~te beams increasec noticeably due to the crack- arrestmg mechamsm of thefibers.bcams F I to 0.60 in F6 the increase in cracking shear strength \vas 52”1., pcrcent, lor all volume fractions of hbers, the increase in hrst crack shear strcngth ViaS found to be higher than those obtaincd in bcams wilh convcntional stirrups.6- Thc llltimate shear strength exhibited substantial improvemcnts compared with plain concrete and this was of the same order as that obtaincd from conventional stirrups even for a fiber volume of \ .2 percent. (For example, when F = 0,0 in beam 82 to 0.6 in beam f15 the incrcase in ultimatc shcar strcngth was \40 pcrccnt) 7-