The following general assumptions are made when performing span detailing:

• The peak reinforcement in each region is determined by taking the maximum reinforcement demand in every cross section over the following regions:
• Support - from support to 0.15L into the span
• Span - from 0.35L to 0.65L
• For a cantilever, the entire span is considered to be in the support region, and none of the span is considered to be in the span region
• For a span with no supports defined, the entire span is considered to be in the span region, and none of the span is considered to be in the support region
• Bar length calculations either consider the span length to center of support, or the clear span length depending upon the code rules (see specific code sections for more details: sections 53.1.3, 53.1.4, 53.1.6 and 53.1.7).
• Bar length calculations consider the support width as necessary (see specific code section for more details)
• At the supports, the lengths of the adjacent span's bar sets are considered in order to keep the detailed bars centered on the supports as much as possible. If an adjacent span has different fractions than the one being detailed, the bar length for this span is determined by selecting the longer of the following length fractions:
  • the span length and length fraction corresponding to this bar set
  • the span length and length fraction of any adjacent span bar set whose fraction overlaps this bar set's fraction

The span detailing is performed in pass 0 before the main design steps begin. The following outlines the pass 0 process:

1. Any user defined reinforcement is removed from the cross sections in the span.
2. A normal pass 1 is designed on the span (with the user defined reinforcement removed).
3. From the resulting design, the peak reinforcement in each region (support and span) is detailed according to the user specified or code span detailing rules.
4. The user defined reinforcement is subtracted from the step 3 requirements, which results in the final pass 0 "span detailed" requirements. The resulting pass 0 design can be approximate if the subtracted user defined reinforcement does not have the same properties as the program designed reinforcement at that location. The final designed reinforcement for each cross section, which will be determined in future passes, will always be accurate.

The pass 0 summarized span detailed design requirements are used as the starting point for the pass 2 span detailed design.