When the "Environment" is set to "Protected", only 8.1.6.1 or 9.5.1 (a) and (b) need be satisfied and no specific crack control measures are required. If a characteristic maximum crack width value is input by the user, crack control measures as outlined in the following section will be completed even if the "Environment" is set to "Protected."

8.6.1(a) and 9.5.1(a) - These sections are not implemented here. Clause 8.1.6.1 and 9.1.1 are implemented in the minimum reinforcement design.

8.6.1(b) and 9.5.1(b) – These sections are always used in the service design, but never used in the max service design.

For beams, reinforcement is added on each face in tension to limit maximum spacing to 300 mm. For one-way and two-way slabs, reinforcement is added to limit maximum spacing to 300 mm or two times the cross section depth, whichever is smaller.

• All bars on the appropriate face (including fractional components for bars at an angle to the cross section) are considered for spacing requirements. A fractional number of bars and spaces may be used.
• User-defined reinforcement that is at an angle to the cross section will only have the component perpendicular to the cross section considered.
• Bars with a diameter of less than half the diameter of the maximum bar diameter on the face being considered are converted to an equivalent number of hypothetical bars with a diameter of half the maximum bar diameter. This conversion is based upon area.

For all other Environments, additional crack control design measures are implemented. There are two options for crack control design:

1. Without Direct Calculation (Tables) (see Section 65.6.12 and 65.6.13)
2. Crack Width Calculation (see Section 65.6.14)

A characteristic maximum crack width can be input by the user or determined from the Design Code using the selected "Environment" design strip or design section property. The "Environment" property controls the maximum steel stress as follows:

• Protected: No crack control checks completed unless a characteristic maximum crack width is input
• Normal: w’_max = 0.3 mm
• Corrosive, Very Corrosive: w’_max = 0.2 mm

Sections with unbonded prestressing are designed as RC sections per Note 1 in clause 8.6.18.6.1 for beams or 9.5.1 for slabs.