QUESTION $1$

FLAT SLAB

$[20]$

The reinforced concrete flat slab panel with a thickness of $225mm$ is shown below. It is a corner panel with a long span and a short span of $6\mathrm{.}00m$ and $4\mathrm{.}00m$ respectively, with both outer edges supported by walls. The slab is supported by rectangular columns measuring $350mm350mm.$ Each direction consists of three panels, ensuring stability throughout the structure.

The design parameters include live load for classrooms and the finishes to the slab amounting to $0\mathrm{.}85k\frac{N}{m^2}.$ The concrete used has a compressive strength $(fcu)$ of $25\frac{N}{m}{m}^2,$ while the reinforcement has a yield strength $($fy$)$ of $450\frac{N}{m}{m}^2.$ The slab has a concrete cover of $30mm.$

Determine the design moments for the slab panel.