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

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

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Structural Analysis
The effective length of lacing is the distance

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

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