Experimental Investigation on Flexural Behaviour of Encased Cold Formed Steel Section in Reinforced Concrete Beams

Objectives: This research investigates flexural behaviour by comparing the experimental findings of two sample specimens: encased Cold Formed Steel (CFS) concrete beams and conventional reinforced concrete beams. Understanding the failure modes seen in encased CFS is critical for developing a safe and efficient composite system. Methods: The flexural behaviour of CFS encased in typical concrete beams was assessed using Four Point Bending Test. Compressive strength, flexural strength, deflection, stiffness, failure modes, load-carrying capacity, and structural performance are determined by the conventional testing methods. Crack patterns, load-deflection response, and failure mechanisms are among the observations made during the testing process. Findings: According to the experimental findings, the encased CFS beam's yield load and ultimate load are 45.32% greater than those of the reinforced concrete beam. Likewise, the encased CFS beam's deflection at yield and ultimate load is 17.73% and 14.10% lower than that of the traditional reinforced concrete beam, respectively. Novelty: Although the idea of encased steel concrete composite is not new, the use of CFS sections in concrete to improve flexural performance is a new application. It demonstrates a creative and promising method in the Civil Engineering sector. Keywords: Cold Formed Steel, Flexural behaviour, Load-deflection, Encased beam, Stiffness