For this assignment, you will complete the preliminary design for a typical floor of a three$-$story

library. $($This means that you will estimate the sizes of the members but that you will not do

the design calculations necessary to finalize the member sizes.$)$ The first floor is a slab$-$on grade

and will be used as a reading room $(LL=60psf).$ The second and third floors will be stacks $(LL=$

$150$ psf $).$ The dead load on each floor $($not the roof$)$ is the self weight plus an additional $20$ psf

for finishing and utilities. The roof live load and snow load are both $20$ psf$.$ The roof also has a

mechanical load $($dead load$)$ of $70$ psf $.$ The building is encased in a self$-$supporting curtain wall

that carries all its vertical and lateral load $($you will not need to design for this$).$ Beams are

spaced at $8$ ft $.,$ girders at $20$ ft $.$ A minimum $12$ ft $.$ of clear height must be maintained between

floors. Limit the total floor depth $($slab $+$ beam$)$ to $24$ in$.$ Keep the column dimensions

consistent from floor to floor $($interior and exterior columns may have different dimensions$).$

Use $f_y=60$ksi and $f_c^{\text{'}}=4$ksi. You may use ACI moment coefficients or fixed end moment values

where appropriate.

Determine:

The slab thickness and reinforcement ratio for a typical floor $(22^{nd}$ or $3^{rd},$ not the

roof or ground floor$)$

The slab thickness and reinforcement ratio for the roof$)$

The dimensions and reinforcement ratio for beams and girders for a typical floor.

Do not place reinforcement or design for shear.

Cross sectional area and reinforcement ratio for an exterior and interior column

$($you may use Figure $1$ in the Preliminary Design handout$)$