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
For under water concreting.

All of these
De-watering by pumping is not done or until 24 hours thereafter
The volume of coarse aggregates shall not be less than one and half times and not more than twice that of fine aggregate
At least 10 percent more cement is required as compared to dry conditions

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

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

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