Abstract
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
metallic-fiber to improve the behaviour of reinforced concrete beams subjected to cyclic loading is
investigated. RC beams containing metallic fibers of two different types in mono and hybrid forms
were constructed and tested under reverse cyclic loading to investigate the possibility of obtaining
ductile and energy dissipating RC beams to be used in seismically active area. Reverse flexural cyclic
loading tests were performed on beams of cross section 150 x 200 mm with a clear span of 1 m. In all
tested compositions of concrete containing fibers, metallic fibers were investigated at maximum
content of 40 kg/m3
and 80 kg/m3
in mono and hybrid forms, respectively. Experimental results
showed that metallic fibers act as energy dissipater in the concrete and significantly improve the
energy dissipation capacity of RC beams. Moreover, from the results obtained in terms of energy
dissipation for RC beam containing fibers in hybrid form, positive interaction between two different
metallic fibers used in this study has also been underscored.
R. Hameed, F. Duprat, A. Turatsinze, A. Sellier, Z.A. Siddiqi. (2011) Behaviour of Reinforced Fibrous Concrete Beams under Reversed Cyclic Loading, Pakistan Journal of Engineering and Applied Sciences, Volume 9, Issue 1.
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