Purpose: Used to define girder spans. (See SPN-1 for parallel/concentric girder system projects.)
--> Given in girder input
In Line Girder Projects, SPN is a list of spans between bearing locations (feet or meters). Spans are measured along horizontal curvature, if present. There is a 20 span limit.
Span Lengths of Girder 1 in Parallel/Concentric Girder System Projects