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Q. A rectangular beam of 200 mm in breadth and 400 mm in depth is simply supported over span of 4m and carries distributed load of 10 KN/m. Find out the maximum bending stress in beam.
Sol.: Given data:
b = 200 mm = 0.2 m
d = 400 mm = 0.4 m
L = 4 m
W = 10KN/m σmax=? We know σmax/y = M/I; σmax
y = d/2 = 0.2 m
M = WL2/8 = (10 × 103 × 42)/8 = 20000 Nm
I = bd3/12 = (0.2 × 0.43)/12 = 0.001066 m4 Putting all values we get;
σmax = (0.2 × 20000)/0.001066 = 3750000 N/m2
= 3.75MPa .......ANS
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