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

As per IS 456:2000 for M20 grade concrete and plain barsin tension the

1.	As per IS 456:2000 for M20 grade concrete and plain barsin tension the design bond stress bd = 1.2 MPa. Further, IS 456:2000 permits this design bond stress value to be increased by 60% for HSD bars. The stress in the HSD reinforcing steel barsin tension, s 360 MPa. Find the required development length, Ld, for HSD bars in terms of the bar diameter,
A.	46.875
B.	56.875
C.	46.975
D.	46.85
Answer» B. 56.875

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