RCC Structures Design
After pre-stressing process is completed, a loss of stress is due to

Shrinkage of concrete
Creep of concrete
Elastic shortening of concrete
All of the listed here

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RCC Structures Design
For a ribbed slab

Overall depth of the slab shall not exceed four times the breadth of the rib
Width of the rib shall not be less than 7.5 cm
Clear spacing between ribs shall not be greater than 4.5 cm
All listed here

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