The 'conjugate beam method' for deflection uses the concept that:
Choose the correct answer
Shear force in conjugate beam = deflection in real beam
Shear force in conjugate beam = slope (θ); bending moment in conjugate beam = deflection (δ) of real beam
The conjugate beam must be identical to the real beam
Curvature = shear force
Correct Answer
B. Shear force in conjugate beam = slope (θ); bending moment in conjugate beam = deflection (δ) of real beam
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Conjugate beam: an imaginary beam loaded with M/EI diagram (curvature diagram) of the real beam, with modified boundary conditions (real pin → conjugate pin, real fixed → conjugate free). 'Shear' in conjugate beam = slope of real beam; 'Bending moment' in conjugate beam = deflection of real beam. Same equilibrium equations apply.
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