Structural Analysis
Castigliano’s first theorem is applicable

when the system behaves elastically
only when principle of superposition is valid
for statically determinate structures only
None of these

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Structural Analysis
The effective length of lacing is the distance

Between the inner end rivets of the bar for single lacing
0.7 of the distance between the inner end rivets of the bar for double lacing
Between the inner ends of effective lengths of welds connecting the members
All of these

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