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From the way it dropped straight down, it doesn't seem like it would be a fatigue or fracture failure. What are the chances of both trusses going at the exact same time? If one failed, it would start falling first and twist the bridge and bring down the other truss. I suspect foundation...

I saw that presentation when I was searching for information. I have single span, new construction bridges for vehicular traffic so it seems to fit the criteria to be able to use spread footings. I used some of the dimensions in that presentation regarding how far away from the wall to set the...

I'll Add my 2 cents. It might make more of an impact on how it is rounded...meaning with some experience, one can round up or down depending on what dimension is being dealt with. For example: for finding a moment in a beam, round the span up and round the loading up. For the structural depth...

Yes, the loading of the footing will need to be supplied to the wall designer. The walls are for a road overpass and a railroad overpass. The total height of the tallest wall is around 36 feet. It was actually the DOT that brought up the use of spread footings on the MSE walls...there just...

Thanks for the info everyone. Indiana doesn't seem to have any standards with a footing without piling (at least I can't find any) so I'm having to rely on other sources at this time. I'm only at the preliminary stage now so as I get further along I'll work with INDOT to see what they will...

In the 17th Edition of AASHTO for Slab Edge Beam Design (3.24.8) a live load moment is given of 0.10PS where P=16k for HS20 and S is the Span Length. Is this Live Load Moment to REPLACE the "normal" computed live load moment? Should impact be added to this Moment? And I assume it is still...

I'm looking into preliminary designs using MSE bridge abutments and I have been gathering as much info as I can. I'm looking at using spread footings without piling for the bridge footings that a few feet back from the MSE wall face. One thing that seems to be a design delimma is that the...