Virtual Labs

Design of RC Isolated Footing with Axial Load

If the axial load on a footing increase, what is the most effective way to maintain structural safety?

a: Decrease footing thickness Explanation

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b: Increase reinforcement and footing dimensions Explanation

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c: Reduce the grade of concrete used Explanation

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d: Ignore the change as concrete has high compressive strength Explanation

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What happens if the soil bearing capacity is lower than expected?

a: The footing size should be increased Explanation

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b: The reinforcement should be decreased Explanation

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c: The column size should be reduced Explanation

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d: The load should be increased Explanation

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How does an eccentric axial load affect the footing design?

a: Creates additional bending moment Explanation

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b: Reduces reinforcement requirements Explanation

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c: Has no impact on footing size Explanation

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d: Increases only the column dimensions Explanation

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Which failure mode is most critical in an RC isolated footing under high axial load?

a: Bending failure Explanation

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b: Punching shear failure Explanation

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c: Torsional failure Explanation

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d: Lateral buckling Explanation

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If the depth of the footing is increased significantly, which of the following statements is true?

a: Bending moment decreases, but punching shear increases Explanation

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b: Both bending moment and shear force increase Explanation

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c: The load-carrying capacity decreases Explanation

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d: There is no impact on structural performance Explanation

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If a square footing of size 2 m × 2 m carries a load of 600 kN, the actual bearing pressure on the soil is:

a: 100 kPa Explanation

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b: 120 kPa Explanation

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c: 150 kPa Explanation

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d: 200 kPa Explanation

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When calculating reinforcement for an RC footing slab, the critical section for bending moment is generally taken at:

a: Centre of the footing Explanation

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b: Face of the column Explanation

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c: Midway between column and edge Explanation

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d: At the footing corner Explanation

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