Question

Consider List-I (parameters) and List -II (factors affecting the parameters) with reference to an reinforced concrete beam.
List-I

A. Maximum tensile reinforcement.

B. Minimum tensile reinforcement.

List-II

1. Grade of concrete.

2. Grade of steel.

3. Exposure conditions.

4. Cross sectional dimension.

• A. $A\to (1,2),B\to (2,3,4)$
• B. $A\to (2,3,4),B\to (1,2,4)$
• C. $A\to \left(4\right),B\to (2,3,4)$
• D. $A\to (3,4),B\to (1,2,3,4)$

Answer 1

The correct option is C $A\to \left(4\right),B\to (2,3,4)$

Maximum tensile reinforcement $=0.04bD$
$\therefore$ Depends on cross sectional dimensions only
Minimum tensile reinforcement $=\frac{0.85}{f_y}\cdot bd$
Effective depth (d), depends on exposure conditions.
Hence, $A_{st,min}$ depends on $f_y$, $b$ and $d$.