CASTIGLIANO's FIRST THEOREM. Explained. Let's understand

#civilengineering
#civil
what is CASTIGLIANO's 1st principle? described with simplicity.
castiglanos first theorem,
castigliano's theorem,
castigliano's first theorem,
castigliano's first theorem gate academy,how to calculate deflection by using castigliano first theorem?
#structuralanalysis
#structuralanalysissoftware