Negative Moment between Dead Load Contra Flexure Points

Document Information

Document Type: FAQ

Product(s): LEAP CONSPAN/Precast/Prestressed Girder

Version(s): All

Original Author: Bentley Technical Support Group - VM

QUESTION: How can the user determine a live load  case where 100% of the negative moment between dead load contra flexure points (effect of two tandem trucks) is applied.  The program applies 90% per AASHTO - is there a way to modify this parameter and get 100%?


The application of 90% of the negative moment as per AASHTO code is hard coded and can’t be changed but one work around solution to this problem is to do 2 runs one by creating custom vehicle by increasing the present axle loads by 10% (that will be 110%) and then the program will apply 90% of it and then the user should be getting 100% of negative moment between dead load contra flexure points .And also the user needs to run one more file with default axle loads just to compare the results.