In limit state design, the design bond stress for deformed bars (conforming to IS 1786) for M20 concrete mentioned in IS 456 : 2000 is (in N/mm2units):

In limit state design, the design bond stress for deformed bars (conforming to IS 1786) for M20 concrete mentioned in IS 456 : 2000 is (in N/mm2units):

Right Answer is:

1.92

SOLUTION

Design bond stresses for deformed bars in tension: For deformed bars conforming to IS 1786 these values shall be increased by 60%.

Design bond stress for bars in compression: For bars in compression, the values of bond stress shall be increased by 25%.

The bond stress for different grades of concrete as per different established provisions are as follows:

Grade M15 M20 M25 M30 M35 M40
WSM 0.6 0.8 0.9 1.0 1.1 1.2
LSM   1.2 1.4 1.5 1.7 1.9

τbd = 1.2 × 1.6 = 1.92 N/mm2

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