Laboratory Evaluation of Equivalent Viscous Damping on Reinforced Self Compacting Concrete Beams Containing Fibers



When earthquakes occur, energy released by the earthquake gets induced into the structure as ground motion and this energy has to be dissipated for safety reasons. To release seismic energy, the structure should damage in such a way that on one hand, collapse of structure should not occur and on the other hand, after the earthquake, damage should be economically feasible to repair. To avoid the collapse of the structures and also to reduce the repair cost after the earthquake, most design codes focus on providing sufficient ductility to structure. Dissipation of large part of injected seismic energy is an important factor for a structure to be seismically resistant. In this contribution, use of fiber to improve equivalent viscous damping (EVD) of reinforced self compacting concrete (SCC) beams subjected to cyclic loading is investigated. Two types of fibers were investigated: Steel fibers and Polyphenylene Sulfide fibers. Maximum dosage of fibers was kept equal to 0.4%(Vf). The findings of this study showed that EVD of SCC is improved with the addition of fibers. Comparison of the effectiveness of two fibers investigated in this study on EVD revealed that increase in the EVD was greater with steel fibers.