I'm using LEAP Bridge Concrete to design a prestressed box beam. In this design we are concerned about haunch heights. I was checking the beam self-weight deflection shown in LEAP vs. the AISC equation and another in-house structural analysis software. The AISC and in-house software deflection values match. LEAP deflection is more by about 7%. I have verified reactions and moment, so input weight is the same. I am using the same bearing to bearing span length and same E. How is LEAP calculating the Beam Self Weight at Release?
Thanks
According to the LRFD design code, if the user invokes the optional live load deflection criteria specified in LRFD Article 3.6.1.3.2, the deflection should be taken as the larger of (a) the resulting deflection from the design truck alone, or (b) the resulting deflection from 25% of the design truck taken together with the design lane load. If you select the “Include LL Deflection” option, the above two conditions are checked and the deflection under the governing load is printed in the camber and deflections section of the printout. Official Website