Answer Posted / mks
Castigliano's theorem is exactly based on strain energy
principle ,which gives the deflection & load acted ata
point .
From castigliano's 1st theorem ...., we can get the
deflection at a point of the body, by getting derivative of
strain energy wrt. the load acted at that point.
From castigliano's 2nd theorem ...., we can get the load at
a point by getting the derivative of total strain energy
wrt. the deflection at that point.
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