Problem

The plan view of a continuous ribbed slab in a building is shown below.

The covering materials weight $3\mathrm{.}5k\frac{N}{m}2,$ the live load is $2\mathrm{.}625K\frac{N}{m}2.$

Use $f^{\text{'}}c=25$MPa and $fy=420$MPa.

Hollow concrete blocks $($hourdis$)$: length $=40cm,$ width $=20cm,$ height $=15,20,25$ or $30cm.$ Rib width $=12cm.$

Beams are considered as embedded. Use a trial web width, $b_w=90cm.$

Columns are square $50cm50cm.($hint: $Ln$ is measured from face to face of beams$).$

It's required to:

Design the one$-$way ribbed slab for flexure and shear $($Only for Max negative moment$)$

Transfer the load from the slab to the supporting beam $C$ and determine their envelope BMD$.$