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

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

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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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