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ESE 2021 Technical Quiz || Design of Column

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Question 1

What will be size of square footing required for a column having load of 2400 kN.

Use M30/Fe 415 (SBC = 125 kN/m2)

(size of column = 500 mm × 500 mm)

(use LSM and assume weight of foundation = 20% of column load)

Question 2

A circular RC column of diameter 450 mm is reinforced with spiral reinforcement of 8 mm diameter. Diameter of longitudinal reinforcement is 16 mm with cover to reinforcement as 40 mm. take M25 grade concrete and Fe415 grade steel. Calculate maximum pitch of the spiral reinforcement:

Question 3

Statement (I): A column with helical reinforcement is preferred over that with lateral ties in seismic zones.

Statement (II): Load carrying capacity of a column with helical reinforcement is more that with lateral ties.

Question 4

Consider following statements related to footings:

1. Critical section for bending moment is at the face of the column for footing supporting a concrete column.

2. Critical section for bending moment is half way between the centre line and edge of the wall for footing supporting a masonry wall.

3. Critical section for one way shear is at a distance equal to effective depth of the footing from centre of the column in case of footings on soils.

4. Critical section for punching shear is at a distance equal to half of the effective depth of the footing from face of the column in case of footings on soils.

Which of the above statement(s) is/are correct

Question 5

The plan of ground floor columns in a building is shown in figure below. It is desired to reduce the longitudinal bar diameter from 28 mm to 20 mm above the second floor level. The lap length (in mm) of bars in flexural tension is
[Take M25 grade of concrete and Fe415 grade of steel and bond strength τbd =1.4 N/mm2]
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Jun 1ESE & GATE CE