Fig. 7. Effects of different fiber types and dosages on shear strength[53]
SF: steel fiber; PF: polypropylene fiber; CF: carbon fiber; PVF: polyvinyl alcohol fiber
The high shear resistance of fiber-reinforced polymer is more widely used on walls. According to the study of Harry et al.[13], the tested composite polyvinyl alcohol fiber wrapped macroscopic synthetic fiber reinforced concrete wall samples present significantly higher values of interfacial shear strength compared with the test wall samples filled with ordinary concrete. The maximum shear load and interfacial shear strength increases by 93.5%. Tran et al.[54] studied the shear capacity of fiber reinforced geopolymeric concrete beams under impact load, and found that the addition of fibers significantly improves the impact response of geopolymeric beams in terms of maximum and residual displacement and reaction force, and reduces negative cracks and spalling cracks. Lakavath et al.[4] conducted experimental and numerical studies on the shear behavior of large synthetic fiber reinforced prestressed concrete beams, and found that a low fiber volume increase of 0.5% does not significantly improve the shear behavior. However, the test and finite element results of the beams with higher volume fractions (1.0% and 1.5%) significantly improves the post-cracking behavior, ductility and ultimate shear resistance of the beams[55].