QUESTION $2$:

A staircase giving access to an office for general use spans longitudinally spanning and is

supported by beams at the end of its landings. The distance between the masonry wall

supports is $4\mathrm{.}5m.$ The staircase comprises $1\mathrm{.}5m$ landings and $2\mathrm{.}24m$ stair flight. The vertical

height between the landings is $1\mathrm{.}44m.$ The risers are $160mm,$ the treads are $280mm$ and

the waist is $200mm$ thick. The staircase will be finished with a $35mm$ screed and the soffit

will receive $30mm$ plaster.

Design the staircase using grade $25/26$ concrete and high tensile reinforcement bars and

sketch a cross$-$section to show the placement of these bars. Assume mild exposure

conditions.