Reference the following building for use with the problems below:

$6$ story building $6$ stories above grade; $1$ basement level

Rectangular building, $200$ x $100$ plan dimensions

Reinforced concrete structure:

$8$ slab typical

$6$ slab at roof

$12$ basement slab

$18$ perimeter foundation wall

Normalweight concrete throughout $(150$ pcf$)$

Water table is located $4$ below grade

Top of basement slab is located $12$ below grade

a$.$ Determine the hydrostatic pressure acting against the bottom of the basement slab.

$(4$ points$)$

b$.$ Check if the structure is buoyant. Consider the load case $0\mathrm{.}9$ D $+1\mathrm{.}0$ H$,$ where D $=$ dead load

and H $=$ hydrostatic load. Ignore the selfweight of columns in selfweight calculation.

$(8$ points$)$