How do you analyze and design two-way concrete slabs?

Two-way slab design methods include: (1) Direct design method - for regular geometry, distributes total static moment to column/middle strips based on panel ratios, (2) Equivalent frame method - models slab as frame for more complex cases, (3) Finite element analysis - for irregular geometry. Design checks include: flexure in each direction, one-way and two-way shear (punching shear at columns), deflection limits, and minimum reinforcement. Punching shear critical - requires stud rails or shear heads for high loads or thin slabs.