Reinforced concrete is a composite material comprising of two materials namely concrete and steel reinforcement. The behaviour of both concrete and steel materials is well documented by past researchers which is considered as a benchmark for analysis and design of structural elements like slabs, beams, columns and footings. In reality, reinforced concrete is a composite material and quantifying its behaviour is relatively difficult due to its complex nature. The parameters affecting its behaviour are concrete grade, percentage of tension and compression reinforcement, stirrup spacing. The aim of present work is to study the effect of stirrup spacing analytically on modulus of elasticity of a beam of cross-section. The beam is of size 200 × 300 × 1850 mm with 2 bars of 10 mm diameter in tension and compression. The variation in spacing of stirrups is adopted as per IS:456-2000 for the cross-section under consideration. The FE analysis of beam models with different stirrup spacing is carried out in ANSYS software.