Verma, V.K.Sahal, Nisha2019-02-022019-02-022018-08http://krishikosh.egranth.ac.in/handle/1/5810093306Limit analysis of reinforced concrete (RC) beams usually disregards the non linear contribution of concrete in tension in evaluation of load carrying capacity. This assumption does not lead to safe design condition e.g in case of flexural members that for architectural or other reasons, have a large cross section than that required for strength. With minimum reinforcement, the tensile concrete strength makes a substantial contribution to the definition of peak cracking load, which may turn out to be higher than the ultimate load. For this reason, Codes of other countries impose limitations on minimum steel in order to prevent sudden failure. Most of them consider two parameter concrete grade and steel yield strength. But minimum limit on longitudinal reinforcement given in the Indian code depend only on steel strength and independent of concrete strength. IS Code provided minimum steel for RC flexural members is based on tests conducted on normal strength concrete, and hence not applicable to high strength concrete beams. Hence comparing the provisions of other national codes, modifications to this limit is suggested. This modified expression may be more justified to prevent sudden failure of flexural member. To study behaviour of RC flexural members, some beams have been modelled and analysis is carried out according to IS 456-2000 code, using ANSYS 12 software. Moment of resistance, Strain, Stress and mid span deflection values for beams are calculated and compared. Conclusion is drawn from this comparison that for high strength concrete it may be prudent to include the concrete strength also in the equation of such limit.ennullThesis