A four span one$-$way slab is supported on $12-$in$-$wide beams with center$-$to$-$center span lengths of

$8,10,10,$ and $8ft($these are the short$-$span lengths $-$ the longer transverse span length is $25ft).$

The slab carries its self$-$weight, a superimposed dead load of $20psf,$ and a live load of $80psf$ that

cannot be reduced. These loads are unfactored.

Select the thinnest possible slab that satisfies minimum thickness requirments $-$ but use the same

slab thickness throughout all spans. Assuming $f_c^{\text{'}}=4500$ and $f_y=60$ksi, specify

reinforcement for the top and bottom of the slab in each principal direction using this format:

Short$-$Span Direction: Top: No$.$ X$1$ bars at Y$1$ in$.,$ Bot: No$.$ X$2$ bars at Y$2$ in$.$

Long$-$Span Direction: Top: No$.$ X$3$ bars at Y$3$ in$.,$ Bot: No$.$ X$4$ bars at Y$4$ in$.$

Show that the slab has adequate flexural and shear strengths, satisfies minimum thickness

requirements, and satisfies the minimum area and maximum spacing requirements in both the

long$-$ and short$-$span directions. Rather than check these at every section, specify top and bottom

slab reinforcement for each principal direction that would work throughout the floor system

$($design based on the worst case location$).$

Provide two sketches: a plan view of the reinforcement layout and a separate cross$-$sectional view

showing the placement of reinforcement at the top and bottom of the slab in one of the four spans.