Question

If the depth of actual neutral axis in a beam is more than the depth of critical axis, then the beam is called

• A. Over-reinforced beam
• B. Under-reinforced beam
• C. Balanced beam
• D. Deep beam

Answer 1

The correct option is A Over-reinforced beam

(a)
Over-reinforced beam: In this type of beam, the steel area provided is more than what is required for a balanced design. Consequently, $A_{st}>A_{st,bal}$, bal· Here the depth of neutral axis is more than that of balanced neutral axis, i.e. $x>x_{cr}$. It can be seen that in this case, the utilization of steel is less than its permissible vaue. The failure in this case is called compression failure and the design is referred to as over-reinforced.