Substructure will generate vessel collision, as specified in AASHTO LRFD, Art. 3.14. First, it calculates the vessel collision energy as follows:

Auto generation of live load fatigue and live load permit are computed in the same manner as the live load. The Centrifugal Force for fatigue, respectively for permit is computed as the existing centrifugal force.

In Substructure, once the barge impact force is calculated, a pop-up message will appear showing the value of this force. Note that you need to manually apply the force on the columns.