What is "Distribution Factor – Line Girder" Analysis?

BrR contains a Distribution Factor – Line Girder Analysis feature that computes live load distribution factors. This feature allows users to analyze a bridge for both standard gage vehicles and non-standard gage vehicles. A 3D and a 2D finite element analysis of the superstructure is performed and moment and shear live load distribution factors are computed for a vehicle traveling along user-specified paths along the length of the superstructure. Moment and shear distribution factors are computed by dividing the 3D model moments and shears by the 2D model moments and shears. A traditional girder line analysis of the beam is then performed using these distribution factors.