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THIS PAPER INVESTIGATES THE STRESS-STRAIN CHARACTERISTICS OF HYBRID FIBER REINFORCED CONCRETE (HFRC) COMPOSITES UNDER DYNAMIC COM-PRESSION USING SPLIT HOPKINSON PRESSURE BAR (SHPB) FOR STRAIN RATES IN THE RANGE OF 25 TO 125 S-1. THREE TYPES OF FIBERS Â HOOKED ENDED STEEL FIBERS, MONOFILAMENT CRIMPED POLYPROPYLENE FIBERS AND STAPLE KEVLAR FIBERS WERE USED IN THE PRODUCTION OF HFRC COMPO-SITES. THE INFLUENCE OF DIFFERENT FIBERS IN HFRC COMPOSITES ON THE FAILURE MODE, DYNAMIC INCREASE FACTOR (DIF) OF STRENGTH, TOUGHNESS AND STRAIN ARE ALSO STUDIED. DEGREE OF FRAGMENTATION OF HFRC COMPOSITE SPECIMENS INCREASES WITH INCREASE IN THE STRAIN RATE. ALTHOUGH THE USE OF HIGH PERCENTAGE OF STEEL FIBERS LEADS TO THE BEST PERFORMANCE BUT AMONG THE HYBRID FIBER COMBINATIONS STUDIED, HFRC COMPOSITES WITH RELATIVELY HIGHER PERCENTAGE OF STEEL FIBERS AND SMALLER PERCENTAGE OF POLYPROPYLENE AND KEVLAR FIBERS SEEM TO REFLECT THE EQUALLY GOOD SYNERGISTIC EFFECTS OF FIBERS UNDER DYNAMIC COMPRESSION. A RATE DEPENDENT ANALYTICAL MODEL IS PROPOSED FOR PREDICTING COMPLETE STRESS-STRAIN CURVES OF HFRC COMPOSITES. THE MODEL IS BASED ON A COMPREHENSIVE FIBER REINFORCING INDEX AND COMPLEMENTS WELL WITH THE EXPERIMENTAL RESULTS.
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