Q$.5$ A $2-$storey frame system as shown in Figure$-1$ is used to support an elevated office in a factory at Rusayl. Each floor carries permanent and variable action of $5K\frac{N}{m^2}$ and $3K\frac{N}{m^2}$ respectively. Additional columns are provided to support the second floor slab that are supported by the beams of the first floor.

The primary beams at first floor have lateral restraint at the supports and at midspan due to the secondary beams. Column of ground floor behave as fixed at both ends and have a brace against minor axis buckling at mid length.

SAP$2000$ is used to analyze the frame system and the result of the analysis is summarized in Figure$2,3$ & $4$ for the first floor beam and ground floor column,

i$.$ Using Figure$-2,$ identify design effects and parameters for the first floor primary beam.

$5$

ii$.$ Recommend the shallowest UKB in S$355$ for the primary beams in the first floor. Also check the recommended section for flange buckling in plane of web.

iii. Using Figure$-4,$ check if UKC $254254167$ in S$355$ can be used for the column of ground floor.

Figure$-1$: Frame System with point loads on columns and distributed load on Slabs

Figure$-$L: Vertical deflection $($in $mm)$ of primary beam under variable action only