Structural Analysis
The effective length of lacing is the distance

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

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Structural Analysis
The minimum horizontal distance between two parallel main reinforcing bars, is

The diameter of the longer bar if their diameters are unequal
The diameter of the bar if their diameters are same
Greatest value of the above
5 mm more than nominal maximum size of the coarse aggregate

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