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Question
If one of the span of a continuous beam is subjected to a clockwise couple, then 
A.
the span will be subjected to positive moment.
B.
the span will be subjected to negative moment.
C.
entire beam will be subjected to positive moment.
D.
one part of the span is subjected to positive moment and the other part to negative moment. 
Answer ( Option D)

one part of the span is subjected to positive moment and the other part to negative moment. 

Solution

A continuous beam is subjected to a couple in one (or more) of the spans. Such a beam is also analyses in the similar manner. The couple will cause negative moments in one part and positive moments in the other part of the span. While taking moment of the bending moment diagram. due care should be taken for the positive and negative bending moments

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