Purpose: Used to apply Caltrans permit loading in LFD projects.
--> Given in girder system input in Girder System Projects. Given in girder input in Line Girder Projects.
The loading shown on page 3-8 of the Caltrans Bridge Design Specifications, LFD is applied in the lane which is closest to the girder for which live load effects are being determined. This is in addition to a standard AASHTO truck loading and/or MILITARY LOADING, or user-defined loading.
In an LFD line girder project the permit loading effect with a load factor of 1.15 is added to HS or military loading with a 1.00 load factor for total LL+I effect. Total effect then is gamma x (dead + LL+I).
In an LFD girder system project the permit loading effect with a load factor of 1.25 is added to HS or military loading with a 1.00 load factor for a total LL+I effect. Total effect then is gamma x (dead + LL+I).