Structural Analysis
The Castigliano's second theorem can be used to compute deflections

For any type of structure
At the point under the load only
For beams and frames only
In statically determinate structures only

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

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