$(5$ Marks$)$:

a$)$ Determine the number of $25M$ longitudinal bars required for a concrete beam that is

$500mm$ wide and $800mm$ deep. Assume the following:

$334kNm$ Factored Moment

$25$MPa concrete, $400$MPa reinforcing steel

$10M$ stirrups

non$-$corrosive, not$-$exposed conditions.

b$)$ Check minimum area of steel or spacing requirements