Tampubolon, S.P. 2026. Experimental Investigation of the Effects of Longitudinal and Transverse Reinforcement Diameters on the Flexural Strength of Reinforced Concrete Beams. Formosa Journal of Science and Technology. 5, 10 (Nov. 2026), 2819–2834. DOI:https://doi.org/10.55927/fjst.v5i10.14.