Coopers E90 Train loads 1

[CivilEmery]

I have a xerox copy of parts of a chart for lateral pressures due to a Coopers E80 Train Load. However, the owner requires a temporary shoring system (soldier pile wall) to be designed using a Coopers E90 Train Load. Could some one please point me to where I can find these charts?

 

[PEinc]

I've never heard of Cooper E90 loading. The AREMA Manual for Railway Engineering has nothing on Cooper E90 loading. It does have E80 loading. Does your spec have a typo? Should the 90 be an 80? I would ask the involved Railroad what is their loading for E90. It just may be that E90 is 12.5% more load than an E80 train because their train is "more important" than everyone else's trains.

 

[gregsmall]

The Cooper loading in the AREMA manual is intended to be scaled up and down according to the loading specified for the design. If you look at the history - in the early years, railroads designed to Cooper Loadings as low as E-40 (and the AREA manual of the day showed the E-40 set of wheels, exactly half of what is currently shown as E-80). A Cooper E-90 design loading is currently specified by several railroads for permanent structures (that may be expected to be in service for 100+ years. It will be several decades before the loadings that railroads are actually running reach this level.

Your charts (presuming they only show the live load effect so we don't have to account for not scaling the dead load pressures) can simply be scaled upwards by 12.5% to get the equivalent E-90.

I don't know the specifics of your situation, but even on a heavy haul mainline track, it seems to be overkill to design a TEMPORARY shoring system to such a high standard since current North American rail traffic (heaviest 286 kip cars = 71.5k axels) rates in the vicinity of E-60-75, depending on what they are running on.

Also, don't forget to use the alternative cooper loading cosnsist of four axels(100 k axels for E-80 = 112.5k axels for E-90)

 

[jdbpe]

I have an allen block wall that is about eight feet tall. We designed the wall using geogrid reinforcement at 24 inch intervals vertically. We want to place a three foot high fence with 2 1/2 inch diameter posts every eight feet behind the wall. Can this be erected after the wall is built. I would think not because penetrating the posts into the soil would damage the geogrid. How else can this be constructed. The post diameter is larger then most goegrid openings and they can't be lined up anyway. Any thoughts.

 

[PEinc]

jdbpe,

I think you're in the right forum, wrong thread. Post a new thread topic.