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The bending moment at A for the beam shown below (with BD being a rigid bar) is

The bending moment at A for the beam shown below (with BD being a rigid bar) is Correct Answer 12 kN-m

Concept-

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Considering a point tool of 3 kN in both upward & downward direction at point D

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This will produce a moment of 3 × 1 = 3 kNm& downward force of 3kN

So, now,

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This will be transferred to point 3 also,

i.e.

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So moment at A = 3 × 3 + 3 = 12 kNm

A rigid bar helps to transfer the load and bending moment from one end to another end.

So here the bar CD can transfer the load and moment to the bar AB.

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