Both criteria are implemented.

9.6.1.2(a) is calculated using the maximum f_c', minimum f_y, and maximum d (of all bars on the appropriate face).

b_w is taken the core width (see Concrete “Core” Determination ). If the core width is zero (there is no core), then b_w is taken as the width of the section.

The bending strength of the section is designed to be at least 1.2 M_cr. This will only control in odd circumstances such as where the specified cover is extremely large.

Post-tensioning is ignored.

A spacing limit of 3h is utilized in accordance with 7.7.2.3. For typically sized beams, this limit will not control the amount of reinforcement.

The provisions for a statically determinate beam with a flange in tension are not implemented.