(Solved): 1. A flat-plate floor system with panels 420ft is supported on 20 -in. square columns. Using ...

1. A flat-plate floor system with panels $4\times 20\mathrm{ft}$ is supported on 20 -in. square columns. Using the ACI Code equations, determine the minimum slab thickness required for the interior and corner panels shown in Fig. below. Edge beams are not used. Use $f_{\mathcal{C}}{}^{?}=4\mathrm{ksi}$ and $f_y^{?}=60\mathrm{ksi}$. (35 points)