Question
As per IS 456:2000 for M20 grade concrete and plain barsin tension the design bond stress tbd = 1.2 MPa.Further, IS 456:2000 permits this design bond stress value to be increased by 60 % for HSD bars. The stress in theHSDreinforcing steel barsin tension, σs = 360 MPa. Find the required development length, Ld, for HSD barsin terms of the bar diameter, φ. __________
Answer: Option A
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