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Question
Determine the net couple moment acting on the following beam shown in figure (Given that load 500 kN is acting at the midpoint of the beam AB)
A.
960 N-m
B.
3960 N-m
C.
840 N-m
D.
None of these
Answer ( Option D)

None of these

Solution

Taking bending moment about A
∑MA = 0    
⇒ –MA + 500 × 3 – 500 – 100 × 6 + 60 = 0
⇒ MA = 460 N-m
So, the net couple moment acting on the beam is 460 N-m, So, Correct answer is option (d)

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