Included code sections – (1), (3)

Excluded code sections – (2), (4)

This section applies only to one-way slabs and two-way slabs.

d is taken as the depth from the compression face (as determined from the "Code Min. Reinforcement Location" setting) to the centroid of reinforcement located closest to the tension face. In PT slabs the tendon locations are included in this calculation.

For cross sections with multiple concrete mixes, the maximum f_ck is used.

See "Code Minimum Reinforcement" for details regarding which face (top or bottom) that the reinforcement will be added to.

For RC slabs, post-tensioning is ignored.

For PT slabs, bonded post-tensioning that is on the tension-most side of the cross section centroid, or is within 10% of the cross section depth of the centroid elevation, is considered as un-tensioned reinforcement. For A_sF_y requirements, tendon (f_py – f_se) is utilized as the available yield stress. Bonded tendons at an angle to the cross section will have vector components of their reinforcement areas applied toward these requirements.

The maximum spacing between bars is limited to the minimum of 400mm or 3h. For two-way slabs in column strips in the first cross section in a support region, the spacing between bars is limited to the minimum of 250 mm or 2h.

In post-tensioned slabs, bonded (grouted) post-tensioning ducts that are on the tension side of the cross section centroid, or are within 10% of the cross section depth of the centroid elevation are considered as equivalent to an un-tensioned bar. These ducts are assumed to be optimally placed for spacing purposes – their plan locations are ignored.

User defined bars are counted toward satisfying the maximum spacing requirements. Bars at an angle to the cross section consider the sum of their vector components divided by the gross area of one bar as the total number of provided bars for spacing calculations.