Short discrete fiber reinforcement is the right choice
in the concrete matrix. De-bounding and pulling out of fibers
requires more force, thereby increasing the durability and
confrontation to repeat and dynamics loads. Fibers substantially
decrease the fragility of concrete and advance its engineering
characteristics, like load bearing capacity, resistance against
impact load, flexural, tensile and fatigue etc. Behavior of SFRC in
tension, compression, flexure and shear has already been studied
separately but no or very little work has been done on combined
state flexure, tension, shear, torsion etc. Present study involves the
investigation of the behavior of SFRC composite M20 beams with
varying percentage fiber content (0.0, 0.50, 0.75 & 1.0%) by
volume under the combined state of tension and shear and
flexure. The testing beam size was taken as100 mm × 100 mm ×
500 mm. Straight fibers 28 mm long and 0.28 mm diameter were
castoff. The specimen beams were tested applying direct tension of
0, 5, 7 and 10kN. For different fiber percent by weight beams were
tested, all the direct tension values were applied to each of the
three beams i.e. total of 48 beams were casted and tested
accordingly. For the beam under combined effect of tension,
flexure and shear, when tested it was observed that ultimate
central deflection and ultimate bending stress were found to
decrease for a particular percentage increment of fiber added
along with increase of tension. It was also observed that for a
specific tension value, deflection increases with increase of fiber
percentage at ultimate load in beams. Bending stress increases at
tension 10 KN for all percentages of fiber content.