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Question
If 300 mm × 600 mm rectangular beam cast with M25 grade concrete subjected to flexure, then the cracking moment of the beam is
A.
36 kN.m
B.
63 kN.m
C.
48.3 kN.m
D.
31.5 kN.m
Answer ( Option B)

63 kN.m

Solution

Given that B × D 300 × 600 mm
& M25 grade of concrete
As we know that
Take Flexural tensile strength i.e. fcr (σ)

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