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Steel is the main material used as reinforcement in reinforced concrete structures. The number of steel used every year continues to increase, the increase has an effect on the availability of the main raw materials of steel, namely iron ore which is a non renewable resources. Therefore, an alternative steel replacement material is needed. Bamboo is one of an alternative chosen as a substitute for reinforcing steel in reinforced concrete structures. In this research, we will use Petung bamboo strips which are anchored using screw nails as flexural reinforcement in concrete beams. This research aims to analyze the behavior of load and deflection relationships in the flexural capacity of bamboo reinforced concrete beams against steel reinforced concrete beams. There are 6 beams used as specimens, 2 bamboo reinforced concrete beams with 1 cm long screw nails, 2 bamboo reinforcing beams with 2 cm long screw nails, and 2 beam with 12 mm steel reinforcement as control beam. The results of the flexural strength of bamboo reinforced concrete with long screw nails 1 cm and 2 cm beam were 44.32 kN and 46.98 kN or 48.64% and 51.56% compared to steel reinforced concrete beams with flexural strength of 91.10 kN.