Author/Authors :
Rezayfar Omid نويسنده Assistant Professor, Department of Civil Engineering, Semnan University, Semnan, Iran , Ranjbaran Fariman نويسنده Department of Civil Engineering, Islamshahr Branch, Islamic AZAD University, Islamshahr, Iran , Mirzababai Rahmatollah نويسنده Department of Civil Engineering, Semnan University, Semnan, Iran
Abstract :
An experimental study has been conducted to study the cyclic behavior of reinforced concrete beams in which steel fibers
were added to the concrete mix. Seven similar geometrically specimens in full scale were studied under four- point bending
test in the form of slow cyclic loading. One sample as a control specimen was made without steel fibers or 0% volume fraction
(vf) and six other samples with 1, 2 and 4% vf of steel fibers in twin models. The maximum and ultimate resistance, ductility,
degradation of loading and unloading stiffness, absorption and dissipation of energy and equivalent viscous damping were
studied in this investigation and the effect of steel fibers on the cyclic behavior was compared with each other. Generally,
the addition of steel fibers up to a certain limit value (vf = 2%) improves the cyclic behavior of reinforced concrete beams
and results in the increase of maximum strength and ultimate displacement.
