In structural analysis, the Castigliano’s First Theorem states that first partial derivative of total strain energy with respect to displacement gives:
ACorresponding force acting at that point
BBending moment at midspan
CSlope at support
DSupport reaction force
Explanation
Castigliano’s 1st Theorem: dU / d(delta_i) = P_i (Force). Castigliano’s 2nd Theorem: dU / d(P_i) = delta_i (Displacement).

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