Hello, I'm new to Leap Bridge Concrete. I'm analyzing a simple span prestressed girder bridge. I'm trying to hand check the Fatigue I enveloped LL+I moment. Can someone please help me determine how Leap Bridge Concrete computes Fatigue loading and where to find the fatigue LLDF (I'm assuming single lane moment LLDF divided by 1.2)? When looking at the Fatigue I Envelope results for an interior girder in the analysis tab of the Precast/Prestressed Girder LL+I: M+ is 1036.7 kip-ft at Midspan, which incidently matches the Service III enveloped loads (see capture 1 below). However, when viewing the Results or Report output for Fatigue I, it shows LL+I: M+ of 698.8 k-ft at midspan and 712.1 at 0.4L and 0.6L (see Capture 2 below). Shouldn't the loads from these printouts loads match? Also, I don't see where to select the fatigue I truck in the available design live loads (it doesn't come up when I select & double click the design truck); however I do see it in the live load library. So I'm not sure what truck loading it's using for Fatigue I. I'm using OpenBridge Designer, so Leap Bridge Concrete CE V18 U2 Version 18.02.02.03.
Yes I agree with your findings no matter what truck I select the program is automatically selecting the default fatigue truck. Below is the screen shot from the user manual and it clearly say
The Fatigue truck is added to Library and Auto selected for fatigue I limit state. I can conclude that the program is considering the fatigue truck by default.
Answer Verified By: TCD
I tested a simple single span bridge and checked the beam 2 results.
In the analysis TAB the Service III and Fatigue I load groups LL+I : M+ values did match .
But in the Shear Moment envelope the Service III and Fatigue I load groups LL+I : M+ values did NOT match.
Please download latest version V19.00.00.22 and double check the output.