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What does E-80 loading refer to?

What does E-80 loading refer to?

What does E-80 loading refer to?

(OP)
Or any of the similar designations? Is there a readily accessible reference on the web? thanks

RE: What does E-80 loading refer to?

Cooper E-80 is a loading due to railroad locomotives and is the standard for designing railway bridges.  You'll need to get the design manual from AREA (American Railway Engineer's Association?) for exact information.

RE: What does E-80 loading refer to?

E-80 surcharge has various axle loadings and spacings, but the heaviest is an 80 kip axle load at 5 feet on center.  Spread over the rail ties, the vertical surcharge is 1882 psf or 80,000# / (5'LF x 8.5' tie width).

RE: What does E-80 loading refer to?

I was taught that E-80 stood for Equivalent 80kN axial load, the maximum allowed load per axle for trucks.  As trucks cause the damage to pavements, E-80s are used to design road pavements, at least in South Africa.  A car counts a 0 E-80s, while a truck would be 1 (one truck) or 5 (five axles per 18-wheeler), I do not remember, with other vehicles being fractions (or multiples) of E-80s.

See this TRL pdf file for further (and more clear) details.

RE: What does E-80 loading refer to?

good point, except if you are in north america - it is cooper railroad loading.  

RE: What does E-80 loading refer to?

The Cooper E-80 surcharge I described above is specified by Conrail, Amtrak, Norfolk Southern, CSX, and others.

The 80,000# axle load acts on a 5 foot axle spacing and 8.5 feet wide ties.  Therefore, the railroads are looking for an 1800 to 1882 psf, vertical, strip pressure used with the Boussinesq equation for a RIGID wall.

RE: What does E-80 loading refer to?

Some railroads, such as Amtrak, also specify an impact factor of 1.5 be appiled to the Cooper E-80 surcharge.

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