Structural Analysis
The effective length of lacing is the distance

Between the inner ends of effective lengths of welds connecting the members
All of these
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

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Structural Analysis
For under water concreting.

The volume of coarse aggregates shall not be less than one and half times and not more than twice that of fine aggregate
All of these
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

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