RCC Structures Design
The width of the rib of a T-beam, is generally kept between

1/3 to 1/2 of rib depth
1/2 to 3/4 of rib depth
1/3 to 2/3 of rib depth
1/7 to 1/3 of rib depth

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RCC Structures Design
Pick up the assumption for the design of a pre-stressed concrete member from the following:

A transverse plane section remains a plane after bending
Variation of stress in reinforcement due to changes in external loading is negligible
All listed here
During deformation limits, Hook's law is equally applicable to concrete as well as to steel

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RCC Structures Design
As per IS : 456, the reinforcement in a column should not be less than

0.6% and not more than 6% of cross-sectional area
0.7% and not more than 7% of cross-sectional area
0.5% and not more than 5% of cross-sectional area
0.8% and not more than 8% of cross-sectional area

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