Structural Analysis
The principle of virtual work can be applied to elastic system by considering the virtual work of

Internal forces only
External forces only
None of these
Internal as well as external forces

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Structural Analysis
For under water concreting.

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

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