Structural Analysis
Independent displacement components at each joint of a rigid-jointed plane frame are

two linear movements and one rotation
three rotations
one linear movement and two rotations
three linear movements

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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
0.7 of the distance between the inner end rivets of the bar for double lacing
All of these

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