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The current work includes an experimental investigation into the shear strength of nanosilica reactive concrete beams. The variable studied was the amount of the nansilica, which ranges from 0% to 3% by weight of cement. The mechanical parameters of the concrete mixture, such as splitting, compressive, and flexural strength, were also studied. Four nanosilica reactive powder concrete beams were subjected to a two-point load and evaluated. Estimating shear behavior was used to failure load, crack patterns and failure mechanisms, load-deflection capacity, and strain distribution. The findings indicate that adding nanosilica to the mix improved the mechanical qualities of the cured concrete. The most significant increase in compressive, splitting, and flexural strengths was observed when nanosilica equaled 3 percent, with increases of 31.3 percent, 45.3 percent, and 50 percent, respectively. Adding NS to reactive powder concrete beams improves shear strength by raising the ultimate shear capacity to 25.1% of the reference beam. In addition, the nanoparticles bridge the cementitious materials, improve beams' ductility, and limit fracture development, and delayed failures. [ABSTRACT FROM AUTHOR]