What Time-Dependent Loss model does Conspan use (CEB 90, ACI 209, LRFD 6th etc.)? In the Design Parameters box in the Girder or Analysis tab there are options for Approximate Method, Refined Method, or Pre '2005 Interims' LRFD to compute losses. This would lead me to believe that the losses are calculated based on the latest LRFD, but I have not seen the losses calculation methodology specified in any of the Conspan literature.