Abstract: In order to research the effect of polypropylene fibers on shear strength of dry joints in precast concrete segmental bridges, experiments were conducted to investigate the shear behavior of C40 regular concrete and C40 polypropylene fiber reinforced concrete. The main parameters for tests were joint types, key numbers, concrete types, amount of polypropylene fibers, and horizontal confining stress levels. The cracking loads, ultimate loads, and residual loads were recorded. The cracking pattern, failure mode and normalized shear stress-vertical slip curve relationship were investigated. It can be concluded that the utilization of polypropylene fibers can improve cracking loads, ultimate loads and the deformation capacity of dry joints specimens. The polypropylene fibers can prevent cracking, but the effect of different amount of polypropylene fibers on the shear behavior is not obvious.