The document describes an experimental study on the effect of stirrup spacing on the energy dissipation capacity of reinforced concrete beams under cyclic loading. Three reinforced concrete beam specimens were tested with varying stirrup spacings of 50mm, 75mm, and 100mm. The results found that the specimen with the closest stirrup spacing of 50mm had the highest initial stiffness and dissipated the most energy compared to the other specimens with wider stirrup spacings.