GATE 2023 RCC & Prestressed Concrete Quiz 49

If a RC beam is getting failed in bond, its bond strength can be increased by:

A short column 400× 400 mm is reinforced with 4 – 25 ∅dia. Then the ultimate load carrying capacity of the column if e_min is less than 0.05 × lateral dimension. Use M20 and Fe415.

Consider following statements regarding compression members

1. The key element in resisting collapse under gravity  load is the column.

2. Column carries only axial loads

3. An axially loaded columns normally some moments in most of the practical cases

4. The design strength of concrete and steel are further reduced in the design of column.

The minimum anchorage length of 12 mm diameter bars of Fe415 grade steel in M30 grade concrete with a design bond strength 2.40MPa and a 90° standard bend at the end is mm (Round of to 2 decimal places)

A RCC column of square cross-section (500 × 500 mm²) has its column load moment interaction diagram as shown in fig below, what is the maximum uniaxial eccentricity at which a factored load P_u = 700 kN can be applied safely? (f_ck = 20 MPa)

For M30 graded of concrete and Fe415 grade of steel, if ₁ is permissible bond stress when deformed bar is used, ₂ is permissible bond stress when bars are under compressive force. Diameter of reinforcement is 12 mm. L₁ is development length when deformed bar is used. L₂ is developed length when bar is in compression, which among the following is/are correct (use LSM)