why total shear can not be taken by bend up bars as shear reinforcement. as IS 456:2000 plain and reinforced concrete code of practice,states at least half of the shear should be taken in the form of stirrups.
Hello Mahesh
I think the reason is that for the design with shear reinforcement, a truss model analogy is used, in which the tension and compression chords are spaced apart by a system of inclined concrete struts and upright or inclined shear reinforcement (at 45°).
I agree with Dr. Saidani and there is another reason related to quality control as you could not easily control the quality of the bending process of bars and you could not easily guarantee that the workers on site would bend the bars at the proper locations. Hence most of codes now depend more on stirrups to do the job.
As indicated above, the issue is one of reliability. There are two issues. One is the anchorage of the bent-up bars, especially at the end spans. The other is ensuring that at all parts of the beam, there is sufficient bottom reinforcement to allow for 'other cases' not accounted for in the design.
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