RCC Structures Design
As the percentage of steel increases

Depth of neutral axis increases
Lever arm decreases
Lever arm increases
Depth of neutral axis decreases

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RCC Structures Design
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than

24 diameters from the centre of the column
42 diameters from the inner edge of the column
42 diameters from the outer edge of the column
42 diameters from the centre of the column

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