Structural Analysis
The effective length of lacing is the distance

Between the inner end rivets of the bar for single lacing
All of these
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

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Structural Analysis
For under water concreting.

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

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