Consider the $3-$storey office building below with the following unfactored service loads.

Roof loads:

$-$ Dead load: qD $=3\mathrm{.}5$ kPa

$-$ Snow load: qS $=3\mathrm{.}6$ kPa

$-$ Live load: qL $=?$ kPa

Floor loads:

$-$ Dead load: qD $=5\mathrm{.}4$ kPa $($including partitions$)$

$-$ Live load: qL $=?$ kPa

a$)$ Sketch the tributary areas of the roof load.

b$)$ Specify the live loads on the roof and floors according to NBC $2020.$

c$)$ Determine the ULS factored loading diagram for girder BG$.$

d$)$ Determine the ULS factored loading diagram for girder BC$.$

e$)$ Determine the ULS design compressive load for column DE$.$