I have several questions and need clarification on several aspects of the load generation in LEAP Bridge for substructure design.
1. For WS, is the "barrier height" in the Geometry tab used for any other purpose besides determining WS? I want to use a larger barrier height to account for a fence or barrier-mounted wall, but I want to verify that this dimension isn't being used by LEAP for other purposes.
2. The 8th ed. of AASHTO requires different wind velocities for each load combination of STR/SVC. I do not see a way to set the Load Combination in LEAP when manually inputting WS. How is this done?
3. For DW loading from future wearing surface, does LEAP run an additional DW=0 load case to account for the lack of FWS or does this need to be configured by the user?
4. Both BR and WL do not provide inputs for tributary length when auto-generating the loads in the LL and WS tabs. It appears LEAP just assumes a length of 1/2 span 1 + 1/2 span 2 by default, which is incorrect in my case. How do you specify the tributary length for these loads?
5. Is there still a limit of 6 lanes for LL auto-generation? I read on another post on these forums that there was a 6 lane limit on LL and BR auto-generated loads. I have a bridge with a clear roadway width of 85.25', so I can fit in 7 lanes @ 12' wide. The LEAP output report for "Superstructure Info" indicates my model has 7 lanes. However, the model itself and all load cases only show up to 6 lanes being loaded. And lastly, the output report for "Live Loading" indicates I only have 5 lanes being loaded. I'm very confused by what LEAP is doing with LL lanes. Can you clarify? Is there a bug in the computation?
And increasing the barrier will not affect anything besides the WS load?
No, Im only talking about MANUALLY inputting loads. How do you manually type in the loads for each load combination? There is no input for load combinations on the normal load input screen. I am NOT talking about auto-generated loads.
Those are not the LL or WS input windows. Those are the BR and WL input windows. I'm asking about defining BR and WL from the LL and WS input windows, respectively. There's no option for defining the length.
All lanes matter. What you are saying about the last lane isn't correct. If I had 8,9, or 10 lanes, I need to analyze for all lanes. Perhaps the 7 or 8 lane case is unnecessary, but I need to AT LEAST analyze for the maximum lane case (e.g. 10 lanes). This is universally true for superstructure (grid) analysis as well as substructure analysis.
What about the LL output? Why does it say I only have 5 lanes? Why doesn't it say 6 lanes (or 7 for that matter)?
What version of LEAP will have this issue corrected?
OK thanks