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

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

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Structural Analysis
The effective length of lacing is the distance

Between the inner ends of effective lengths of welds connecting the members
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
All of these

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