Ductile Behavior of RC Beam with Steel Fibres under Cyclic Loading
Steel and concrete composite beams are popular forms of load carrying systems where the advantages of both the materials are exploited. But in recent times the need to study these composite beams under dynamic and cyclic loadings is on the rise with seismic effects dominating in many places in India. Here in this study an attempt is made to assess the behaviour of composite beams under cyclic loading and later enhance the property of flexibility through fibres so that these beams have sufficient energy absorption capacity. By doing so the ductile behaviour of the concrete will also be enhanced, which is already well recognized as one of the durable properties of concrete.
In this work, results of study on 12 beams of normal concrete, concrete with steel and composite beam with steel fibre reinforcements-termed as SFRC-concrete with grades of strength M25 & M30 are reported. Experimental analysis of these beams was carried out mainly to investigate the behaviour of the beams under cyclic loading and find out their energy absorption capability. Based on these tests, the cumulative ductility factor, initial stiffness and relative and cumulative energy absorption of both ordinary and SFRC beams are compared to bring out the role of fibres in steel composite beams under cyclic loadings.
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