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Question

The vertical stress at some depth below the corner of a 2 m × 3 m rectangular footing due to a certain load intensity is 100KN/m2. What will be the vertical stress in KN/m2 below the centre of a 4 m × 6m rectangular footing at the same depth and same load intensity?

A
25
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B
100
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C
200
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D
400
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Solution

The correct option is D 400

All part I, II, III and IV are of equal area

Vertical stress at the centre of rectangular footing (4m × 6m)

=[verticalstressatthecentreofpartI,(2m×3m)]×4

=100× 4

=400 KN/m2

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