I am using the Substructure module of LEAP Bridge Concrete.
According to AASHTO LRFD, you can't have a truck on both the approach slab and on the deck, but you can have a lane load on both.
When generating live loads for an abutment, there are two check boxes to include live loads on an approach slab. One box is for truck loads and one box is for lane loads.
When I click either of the boxes for truck or lane load, i would expect it to create a force and moment under the "Cap/Stem Loads" for at least some of the auto generated live loads, but it doesn't seem to. When I auto generate a future wearing surface load using DW on the approach slab, it does create a force and moment under the "Cap/Stem Loads."
I am wondering if the boxes for the truck and lane load on the approach slab are working at all and if so how can i tell?. I am also wondering if by clicking the button for the truck load on the approach slab, will it make sure that there isn't a truck load on the deck for the same auto generated live load case?
Thanks,
Rob
Ryan, The way LEAP does approach slab reactions is if you select "Compute Continuous Reaction" and "Include Approach Slab" when auto generating the live load then LEAP considers the approach slab to just cantilever off the end of the abutment. So for your example you would have your main spans and then an 18 foot cantilever off the back of the abutment. A 15 kip lane load reaction does sound like what you would get from running an analysis like LEAP does it for the above analysis choices.
Pere, That is the section I was referring to. The same truck could be on the approach slab and the main span and straddle the abutment, but you couldn't have one truck on the approach slab and a separate truck on the main span.