Purpose: Used to select assumption for determining live load deflections in Girder System Projects. (Not applicable to Line Girder Projects.)
--> Given in girder system input
Live load deflections are averaged for all girders according to AASHTO 10.6.4 (ASD, LFD) or 2.5.2.6.2 (LRFD). A separate influence surface is constructed for average girder deflections. Cannot be used if wheel distribution is used.
It is the responsibility of the user to determine if the amount of skew, curvature, or grid layout permits such live load deflection averaging.