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THIS STUDY FOCUSES THE LIGHT ON THE SHEAR BEHAVIOR OF PRE-CRACKED BEAMS, AND EXAMINES THE FEASIBILITY OF APPLYING FRACTURE MECHANICS CONCEPTS TO WIDEN THE UNDERSTANDING OF SHEAR BEHAVIOR AND MECHANISMS. THE EXPERIMENTAL PROGRAM CONTAINS TEN BEAM SPECIMENS OF HIGH STRENGTH CONCRETE (HSC) AND STEEL FIBER REINFORCED CONCRETE (SFRC). PRE-CRACKS WERE EMBEDDED WITH DIFFERENT SIZES AND LOCATIONS ALONG THE FAVORABLE PATH AND ORIENTATION TO SHEAR FAILURE. THREE MAIN SCENARIOS OF SHEAR FAILURE WERE REPORTED WITH MINUTE EFFECT OF PRE-CRACKS. THE GEOMETRICAL EFFECT IS DOMINANT WITH MARGINAL EFFECT OF THE MATERIAL’S NONLINEARITY IN CASE OF SEVERE PRE-DIAGONAL CRACK IN HSC WHILE THE NONLINEARITY OF THE MATERIAL IS SUPREME TO THAT OF THE GEOMETRICAL EFFECT FOR SFRC AND SHORTER CRACKS. FOR VERIFICATION, NUMERICAL SIMULATION WAS CONDUCTED TO EXAMINE THE GEOMETRICAL EFFECT OF THE PRE-DIAGONAL TENSION CRACK IN SHEAR SPAN ON THE STRUCTURAL BEHAVIOR OF RC BEAMS. IT IS FOUND NUMERICALLY THAT, WHEN THE CRACK TIP OF THE TENSILE CRACK IS AWAY FROM THE TENSILE REINFORCEMENT, THE CLOSURING MOMENT OF TENSILE REINFORCEMENT INCREASES, AND AS A RESULT REDUCES THE STRAIN ENERGY RELEASE RATE. THEREFORE, THE TENSILE CRACKS STOP AND THE SHEAR CRACKS KEEP PROPAGATING LEADING THE FAILURE MECHANISM TO THE END FAILURE POINT.
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