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Question

In RCC beams, as the percentage areas of tensile steel increases

A
depth of neutral axis increases
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B
depth of neutral axis decreases
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C
depth of neutral axis does not change
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D
lever arm increases
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Solution

The correct option is A depth of neutral axis increases
(a)
Moment of area below neutral axis increases as the area of reinforcement is increased. To accommodate this increase, the area of moment for concrete above neutral axis should also increase. Thus neutral axis shifts downwards and depth of neutral axis increases.

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